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

1,1

Comments

Column 7 of A195232

Links

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

Example

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

Crossrefs

Sequence in context: A100310 A124963 A295167 * A162236 A215874 A348594

Adjacent sequences: A195228 A195229 A195230 * A195232 A195233 A195234

Keyword

nonn

Author

R. H. Hardin Sep 13 2011

Status

approved