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 A167550 #4 Jun 02 2025 02:10:30 %S A167550 1,7,62,762,12264,245640,5897520,165145680,5284782720,190253266560, %T A167550 7610141548800,334846347897600,16072626136089600,835776577757721600, %U A167550 46803488615967283200,2808209320881060096000,179725396599156215808000 %N A167550 The a(n,n+1) diagonal of the ED1 array A167546. %F A167550 a(n,n+1) = 4*(n-1)*a(n-1,n)+3*(n-1)! with a(1,2) = 1. %Y A167550 Equals the a(n, n+1) diagonal of the ED1 array A167546. %K A167550 easy,nonn %O A167550 1,2 %A A167550 _Johannes W. Meijer_, Nov 10 2009