cp's OEIS Frontend

A195216 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 4 or less and triangles differing by a constant counted only once.

%I A195216 #7 Jul 22 2025 12:40:27
%S A195216 1,61,18903,31640829,289301569283,14572563308953245,
%T A195216 4059527861103273129317,6270118871204192400242141667,
%U A195216 53785756580019628016324622812810239
%N A195216 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 4 or less and triangles differing by a constant counted only once.
%C A195216 Column 4 of A195220
%e A195216 Some solutions for n=5
%e A195216 ...0...............0...............0...............0...............0
%e A195216 ..-4.-3...........-4.-4............4..4............3..1............2..1
%e A195216 ..-6.-2.-5........-7.-3..0.........2..1..3.........3.-1.-1........-1..1..1
%e A195216 ..-5.-5.-2.-4.....-4.-4.-1.-2......3..5..5..4......1..3..0.-4.....-3.-3.-1.-1
%e A195216 ..-6.-4.-4.-5.-7..-5.-5.-2.-4.-3...2..2..1..5..8...2..3..0.-2.-2..-3.-1.-1..0..0
%K A195216 nonn
%O A195216 1,2
%A A195216 _R. H. Hardin_ Sep 13 2011