A194996 Number of lower triangles of an n X n 0..6 array with each element differing from all of its horizontal and vertical neighbors by one

7, 22, 114, 888, 10804, 199988, 5740166, 251606900, 17066691742, 1770282323740, 283975401794580, 69694377176377328, 26447798453646675184, 15357128901797793996652, 13788844798416302935620998

Offset

1,1

Comments

Column 6 of A194998

Links

R. H. Hardin, Table of n, a(n) for n = 1..22

Example

Some solutions for 4X4
..5........4........2........1........5........4........3........2
..6.5......5.4......3.2......2.3......4.3......5.6......4.5......3.2
..5.4.3....4.5.4....2.1.2....3.4.3....3.4.3....4.5.6....3.4.5....4.3.4
..4.5.4.3..3.4.5.6..1.2.1.0..4.3.2.3..2.3.4.5..5.6.5.4..4.5.6.5..5.4.3.4

Crossrefs

Sequence in context: A222178 A117110 A027838 * A380063 A330089 A000835

Adjacent sequences: A194993 A194994 A194995 * A194997 A194998 A194999

Keyword

nonn

Author

R. H. Hardin Sep 07 2011

Status

approved