cp's OEIS Frontend

A195217 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 5 or less and triangles differing by a constant counted only once.

%I A195217 #7 Jul 22 2025 12:40:34
%S A195217 1,91,51205,189677411,4677360495205,774355028021195459,
%T A195217 863969905606597340602967,6512935591253221256126051469607
%N A195217 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 5 or less and triangles differing by a constant counted only once.
%C A195217 Column 5 of A195220
%e A195217 Some solutions for n=5
%e A195217 ...0...............0...............0...............0...............0
%e A195217 ...3..3............2.-2...........-1.-2...........-3..0............4..1
%e A195217 ...2..0..4.........0..3.-1.........1..3.-1.........0..2..3.........6..2..5
%e A195217 ..-2..0..2..1......1.-2.-1.-5......5..2..2.-2.....-3.-2.-2.-1......3..5..6..8
%e A195217 ...0..3..0.-1..3...0.-1.-5..0.-3...3..1.-2.-3..2...1..0..0.-1.-3...6..5..6..3..3
%K A195217 nonn
%O A195217 1,2
%A A195217 _R. H. Hardin_ Sep 13 2011