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 A274727 #4 Jul 03 2016 20:17:21 %S A274727 365,6144,25268,421904,7016284,116633012,1980677448,33415073716, %T A274727 564905405336,9541460598408,161295215603556,2725041270964876, %U A274727 46055189349633552,778212220006487596,13151212573069796840 %N A274727 Number of nX7 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) or (-1,0) and new values introduced in order 0..2. %C A274727 Column 7 of A274728. %H A274727 R. H. Hardin, <a href="/A274727/b274727.txt">Table of n, a(n) for n = 1..210</a> %H A274727 R. H. Hardin, <a href="/A274727/a274727.txt">Empirical recurrence of order 59</a> %F A274727 Empirical recurrence of order 59 (see link above) %e A274727 Some solutions for n=3 %e A274727 ..0..1..0..1..0..2..2. .0..1..2..1..0..1..1. .0..0..0..1..0..2..0 %e A274727 ..1..0..1..0..1..0..1. .1..0..1..0..1..0..2. .2..2..2..2..1..0..1 %e A274727 ..2..2..2..2..2..1..0. .0..1..0..1..0..2..0. .0..1..1..1..0..1..0 %Y A274727 Cf. A274728. %K A274727 nonn %O A274727 1,1 %A A274727 _R. H. Hardin_, Jul 03 2016