A195231 Number of lower triangles of an n X n 0..7 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by one or less.

8, 50, 610, 14536, 681942, 63338492, 11683832092, 4290676097374, 3142339851746238, 4595720660886942892, 13436641716584454488144, 78603060373509486868646762, 920680713893261032002755485080

Offset: 1

Author

R. H. Hardin Sep 13 2011

Keywords

• nonn

Comments

Column 7 of A195232

Examples

			Some solutions for n=4
..1........5........0........1........1........6........7........5
..0.1......6.5......1.0......2.2......2.1......5.6......7.6......5.4
..1.1.2....6.6.5....0.1.1....2.2.2....1.2.2....6.6.5....6.7.6....5.4.4
..0.1.1.2..6.6.6.6..1.0.1.2..2.1.2.2..1.1.1.2..6.6.6.6..6.6.6.7..5.4.4.3
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..15