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 A068283 #11 Feb 07 2024 18:56:30 %S A068283 1,12,264,11424,1009608,185900256,71883991272,58646051219616, %T A068283 101273697848025960,370689919380760915680,2880341312871966116331528, %U A068283 47562687666338563715921774496 %N A068283 1/4 the number of colorings of an n X n staggered hexagonal array with 4 colors. %C A068283 Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4. %Y A068283 Cf. A068239-A068305, A000332, A002417, A027441, A212194, A212195. %K A068283 nonn %O A068283 1,2 %A A068283 _R. H. Hardin_, Feb 24 2002 %E A068283 a(9) from _Alois P. Heinz_, May 03 2012 %E A068283 a(10)-a(12) from _Sean A. Irvine_, Feb 07 2024