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 A056952 #16 Jul 02 2025 16:02:00 %S A056952 0,1,1,2,4,8,20,44,124,300,920,2420,7940,22460,78040,235260,859580, %T A056952 2741660,10477880,35152820,139931620,491459820,2030707640,7436765660, %U A056952 31805257340,121046445260,534514790680,2108118579060,9591325648580 %N A056952 Numerators of continued fraction for alternating factorial. %F A056952 a(0)=0; a(1)=1; a(n) = a(n-1) + (n/2)*a(n-2). %F A056952 a(2n) = A002793(n); a(2n-1) = A002793(n) - n * A002793(n-1). - _Max Alekseyev_, Jul 07 2010 %Y A056952 Cf. A002793, A056922 (denominators). %K A056952 nonn,frac %O A056952 0,4 %A A056952 _Aleksandar Petojevic_, Sep 05 2000 %E A056952 More terms from _James Sellers_, Sep 07 2000