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 A027247 #8 Oct 26 2019 16:16:14 %S A027247 1,2,11,42,216,926,4805,21594,113176,523158,2766030,13043426,69508528, %T A027247 332880898,1786840975,8666578226,46835595908,229627064562, %U A027247 1248785459646,6180314464290,33808696703208,168713818115262,927994263768204,4665292098508258,25791693351775736 %N A027247 a(n) = self-convolution of row n of array T given by A026780. %K A027247 nonn %O A027247 0,2 %A A027247 _Clark Kimberling_ %E A027247 More terms from _Sean A. Irvine_, Oct 26 2019