Abstract
Firstly, a new sequence transformation that can be expressed in terms of a ratio of two pfaffians is derived based on a special kernel. It can be regarded as a direct generalization of Aitken’s Δ2 process from the point of view of pfaffians and then the corresponding convergence acceleration algorithm is constructed. Numerical examples with applications of this algorithm are also presented. Secondly, we find a way to generalize the Shanks transformation via pfaffians so that a larger class of new sequence transformations are derived. The corresponding recursive algorithms are also proposed.

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Acknowledgements
We thank Dr. S.H. Li for his useful conversations.
Funding
X.K. Chang was supported in part by the National Natural Science Foundation of China (Grant Nos. 11688101, 11731014, 11701550) and the Youth Innovation Promotion Association CAS. Y. He was supported in part by the National Natural Science Foundation of China (Grant No. 11971473), the Youth Innovation Promotion Association CAS, and the National Key Research and Development Program of China (No. 2020YFA0714200). X.B. Hu was supported in part by the National Natural Science Foundation of China (Grant Nos. 11931017, 11871336 and 12071447).
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Liu, YJ., Chang, XK., He, Y. et al. Generalizations of Shanks transformation and corresponding convergence acceleration algorithms via pfaffians. Numer Algor 88, 1733–1756 (2021). https://doi.org/10.1007/s11075-021-01092-y
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DOI: https://doi.org/10.1007/s11075-021-01092-y