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 A243315 #4 Jun 03 2014 09:10:48 %S A243315 1,55,237472,371654153,757341382671,1450226501771584, %T A243315 2820152941289640505,5463664833842177843423, %U A243315 10594819370472223969569120,20540255065209806005525289313,39823725482559144291828665014967,77209746313875957204633819730760448 %N A243315 Number of ways to reciprocally link elements of an n X 9 array either to themselves or to exactly one king-move neighbor. %H A243315 Alois P. Heinz, <a href="/A243315/b243315.txt">Table of n, a(n) for n = 0..100</a> %Y A243315 Column k=9 of A220644. %K A243315 nonn %O A243315 0,2 %A A243315 _Alois P. Heinz_, Jun 03 2014