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 A056922 #18 Jul 02 2025 16:02:00 %S A056922 1,1,2,3,8,11,41,52,249,301,1754,2055,14084,16139,127057,143196, %T A056922 1272625,1415821,14015014,15430835,168323364,183754199,2189619553, %U A056922 2373373752,30670104577,33043478329,460235322854,493278801183 %N A056922 Denominators of continued fraction for alternating factorial. %H A056922 Seiichi Manyama, <a href="/A056922/b056922.txt">Table of n, a(n) for n = 0..897</a> %F A056922 a(0)=1; a(1)=1; a(2*n) = n*a(2*n-1) + a(2*n-2); a(2*n+1) = a(2*n) + a(2*n-1). %Y A056922 Cf. A058799, A056952 (numerators). %K A056922 frac,easy,nonn %O A056922 0,3 %A A056922 _Aleksandar Petojevic_, Sep 05 2000 %E A056922 More terms from _James Sellers_, Sep 07 2000