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 A067015 #8 Nov 29 2023 22:03:45 %S A067015 1,1,4,1,9,9,3,1,16,72,96,32,1,25,225,910,1695,1355,440,70,5,1,36,522, %T A067015 3936,16659,39996,52860,36108,11871,1960,270,36,3,1,49,1029,12166, %U A067015 89551,429058,1361619,2864113,3946208,3481835,1904833,621026,116060,12285,693,7 %N A067015 Triangle T(n,k) (n>=1, rows have irregular lengths) giving number of arrangements of k nonattacking princes on an n X n staggered hexagonal torus board. %C A067015 A partition function for the staggered grid torus. %H A067015 Sean A. Irvine, <a href="/A067015/b067015.txt">Table of n, a(n) for n = 1..413</a> (rows 1..15 flattened) %e A067015 1; 1,4; 1,9,9,3; 1,16,72,96,32; 1,25,225,910,1695,1355,440,70,5; ... %Y A067015 Row sums give A066865. %K A067015 tabf,nonn %O A067015 1,3 %A A067015 _R. H. Hardin_, Feb 17 2002 %E A067015 Offset corrected by _Sean A. Irvine_, Nov 29 2023