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 A181159 #5 Jan 09 2023 09:05:51 %S A181159 1,2,6,4,16,12,36,34,28,10,82,72,166,58,142,118,52,262,238,250,130,22, %T A181159 382,370,232,670,190,112,652,492,766,328,610,172,70,1066,910,874,514, %U A181159 490,1492,466,1390,352,1330,46,2050,1212,1042,862,2026,832,322,2470,2350,1912,742,2710 %N A181159 First occurrence of n in A181157. %Y A181159 Cf. A181157. %K A181159 nonn %O A181159 1,2 %A A181159 Keisuke Sato (st(AT)r3z.org), Oct 07 2010 %E A181159 More terms from _Michel Marcus_, Jan 09 2023