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 A305727 #10 Jun 25 2018 08:47:19 %S A305727 0,1,1,11,76,681,5951,55848,535183,5271067,52869443,538800385, %T A305727 5561723366,58036466462,611198554760,6487849585537,69343498969503, %U A305727 745643172902139,8060711122273285,87554655576067959,955068718558844654,10458203081050142684,114918482735213986323 %N A305727 Shifts left when Euler transform applied 10 times. %H A305727 Alois P. Heinz, <a href="/A305727/b305727.txt">Table of n, a(n) for n = 0..938</a> %Y A305727 Column k=10 of A144042. %Y A305727 Cf. A316110. %K A305727 nonn,eigen %O A305727 0,4 %A A305727 _Alois P. Heinz_, Jun 21 2018