A195243 Number of lower triangles of an n X n 0..3 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less

4, 46, 1682, 190514, 67379894, 74236765958, 254948725307650, 2728873272983950594, 91038149737139587502854, 9466106148769015848820814134, 3067809430979519600024270636572850

Offset

1,1

Comments

Column 3 of A195248

Links

R. H. Hardin, Table of n, a(n) for n = 1..18

Example

Some solutions for n=5
..1..........2..........1..........3..........0..........1..........0
..0.2........2.1........0.2........1.1........2.1........1.3........2.1
..2.0.2......2.0.0......2.1.3......1.1.2......0.2.2......3.3.1......0.2.2
..0.0.1.3....2.1.1.2....0.2.1.3....3.2.1.1....2.1.1.0....3.1.1.3....2.1.1.0
..0.1.2.3.3..1.2.2.1.0..2.1.3.3.3..2.1.2.2.3..1.0.0.1.2..2.3.2.2.1..1.0.0.1.2

Crossrefs

Sequence in context: A002077 A113096 A135078 * A269005 A107766 A065777

Adjacent sequences: A195240 A195241 A195242 * A195244 A195245 A195246

Keyword

nonn

Author

R. H. Hardin Sep 13 2011

Status

approved