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 A121892 #11 Nov 17 2024 13:22:54 %S A121892 1,2,4,24,192,1920,23040,322560,5160960,92897280,1857945600, %T A121892 40874803200,980995276800 %N A121892 Row sums of triangle in A066094. %F A121892 a(0)=1, a(1)=2, a(n)=A000165(n)/2 for n>1. %F A121892 a(n)=A032107(n), n>0. - _R. J. Mathar_, Jun 05 2008 %F A121892 G.f.: 1 + x + x/Q(0), where Q(k) = 1 - 4*x*(2*k+1) - 4*x^2*(2*k+1)*(2*k+2)/( 1 - 4*x*(2*k+2) - 4*x^2*(2*k+2)*(2*k+3)/Q(k+1) ) ; (continued fraction). - _Sergei N. Gladkovskii_, Sep 23 2013 %F A121892 a(n) = A002866(n) for n>=2. - _Alois P. Heinz_, Nov 17 2024 %Y A121892 Cf. A000165, A002866, A032107, A066094. %K A121892 nonn %O A121892 0,2 %A A121892 _Philippe Deléham_, Sep 01 2006