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 A038751 #8 Apr 30 2025 13:59:08 %S A038751 0,1,1,0,1,1,2,3,6,9,18,30,60,105,210,381,765,1425,2868,5454,11004, %T A038751 21210,42930,83673,169851,333843,679602,1345476,2745636,5467275, %U A038751 11182365,22379895,45866418,92180781,189275955,381831396,785328636 %N A038751 A variant of the recurrence for A001190. %C A038751 See Maple program for the recurrence. %p A038751 A038751 := proc(n) option remember; local s,k; if n<=1 then RETURN(n); else s := 0; if n mod 2 = 0 then s := A038751(n/2) * (A038751(n/2) + 1)/2; for k from 1 to n/2 - 1 do s := s + A038751(k) * A038751(n - k); od; RETURN(s); else for k from 1 to (n - 1)/2 - 1 do s := s + A038751(k) * A038751(n - k); od; RETURN(s); fi; fi; end; %Y A038751 Cf. A001190, A038750. %K A038751 nonn %O A038751 0,7 %A A038751 _N. J. A. Sloane_, May 03 2000