A195277 Number of lower triangles of an n X n integer array with each element differing from all of its vertical and horizontal neighbors by 7 or less and triangles differing by a constant counted only once.
1, 225, 507375, 11755976175, 2834518121474625, 7151051711514319493625, 189393562987102056163761489375
Offset: 1
Keywords
Examples
Some solutions for n=5 ...0...............0...............0...............0...............0 ..-5.-7...........-1.-5...........-7.-7...........-1.-8............4..6 ..-8.-9.-8.........5..2..9........-7-14-17.........2.-4-11........-1.-1.-2 ..-1.-2.-3..1.....-1.-5..2..8.....-4.-7-14-10......1.-1.-5.-7......2..4..4.-3 ...5..3..3..5..6..-3.-2..5..9..6..-2.-5.-8-12-12..-1..4..0.-7-14...4..3..4.-3.-1
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