cp's OEIS Frontend

A195218 Number of lower triangles of an n X n integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by 6 or less and triangles differing by a constant counted only once.

%I A195218 #7 Jul 22 2025 12:40:41
%S A195218 1,127,117585,845613769,47764170577925,21369796486647028143,
%T A195218 76019997788404353762724447,2155668406192527252815282495516543
%N A195218 Number of lower triangles of an n X n integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by 6 or less and triangles differing by a constant counted only once.
%C A195218 Column 6 of A195220
%e A195218 Some solutions for n=5
%e A195218 ...0...............0...............0...............0...............0
%e A195218 ..-4.-4...........-5..0...........-1..3............6..0............6..1
%e A195218 ...1..2..0........-5..0.-4........-1..4..1.........2..3..6.........2..2.-4
%e A195218 ..-2.-1..2..5......0.-4..1.-2.....-1..5..2.-4.....-2..0..1..2......6..0.-3.-1
%e A195218 ..-6.-2.-1..0..2...2..1..0.-5.-1...0..5.-1..0.-5..-6..0..3..4..5...3..1..0.-4.-1
%K A195218 nonn
%O A195218 1,2
%A A195218 _R. H. Hardin_ Sep 13 2011