This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A127635 #4 Oct 01 2021 18:06:13 %S A127635 1,4,44,1360,118864,29454720,20723316480,41430374667264, %T A127635 235483137163985920,3806579106735674587136, %U A127635 175045931960590896961989632,22902901668710944230193460535296,8527272133354589357030560193109508096 %N A127635 Hankel transform of A047098. %F A127635 a(n) = 2^n*A051255(n). %Y A127635 Cf. A047098, A051255. %K A127635 easy,nonn %O A127635 0,2 %A A127635 _Paul Barry_, Jan 21 2007