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 A026077 #3 Mar 30 2012 18:56:04 %S A026077 1,6,40,232,1352,7854,45683,266214,1554684,9098740,53357985,313495934, %T A026077 1845063496,10876094870,64203285600,379498497900,2245861126596, %U A026077 13305537121404,78907795361228,468393492593496 %N A026077 a(n) = T(2n,n+1), where T is the array defined in A024996. %K A026077 nonn %O A026077 1,2 %A A026077 _Clark Kimberling_