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 A277132 #8 Oct 01 2016 11:55:55 %S A277132 1,3,14,78,508,3796,32048,301872,3139680,35746080,442258560, %T A277132 5909028480,84802072320,1301090515200,21253339699200,368281038182400, %U A277132 6747621163315200,130338926671564800,2647326900234240000,56404832240977920000 %N A277132 The first subdiagonal of triangle A196842. %F A277132 a(n) = A196842(n,n-1). %F A277132 a(n) + (-2*n-1)*a(n-1) + n^2*a(n-2) = 0. %Y A277132 Cf. A196842. %K A277132 nonn,easy %O A277132 1,2 %A A277132 _R. J. Mathar_, Oct 01 2016