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 A026878 #7 Mar 17 2023 01:40:18 %S A026878 1,7,37,177,809,3614,15959,70101,307442,1349374,5935806,26195458, %T A026878 116049130,516291384,2307167923,10357044612,46705335181,211564961875, %U A026878 962540059715,4397719306200,20174135878046,92905048669662,429412711250262 %N A026878 a(n) = T(2n+1,n+3), T given by A026758. %Y A026878 Cf. A026758. %K A026878 nonn %O A026878 2,2 %A A026878 _Clark Kimberling_