cp's OEIS Frontend

A195219 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 7 or less and triangles differing by a constant counted only once.

%I A195219 #7 Jul 22 2025 12:40:49
%S A195219 1,169,239891,3048698613,350767341744137,368448539594713382337,
%T A195219 3546881146489163009435488735
%N A195219 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 7 or less and triangles differing by a constant counted only once.
%C A195219 Column 7 of A195220
%e A195219 Some solutions for n=5
%e A195219 ...0...............0...............0...............0...............0
%e A195219 ...3..5............0..0............1..7............0.-3...........-5.-2
%e A195219 ..-1.-1.-2.........6..0.-4.........2..0..0........-2.-1.-2........-5..1.-5
%e A195219 ...2.-1..0..1......5..1.-3.-1......3..2..7..4.....-1..5..3..4.....-6.-5.-3.-9
%e A195219 ...2.-3.-6.-5.-4...3..2..2.-3.-3..-3..2..6..8..1...3.-1..5..1..2..-2.-2.-2.-6-12
%K A195219 nonn
%O A195219 1,2
%A A195219 _R. H. Hardin_ Sep 13 2011