A194793 Number of lower triangles of an (n+1)X(n+1) 0..7 array with new values introduced in row major order 0..7 and no element equal to any horizontal, diagonal, antidiagonal or vertical neighbor

1, 10, 1719, 4018152, 55882468218, 3454550787171726, 921229375293720351150, 1058115897991435552912456494, 5234423089116609084311564185372068, 111525513162694816614399225360134812623972

Offset

1,2

Comments

Column 7 of A194794

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

Some solutions for 4X4
..0........0........0........0........0........0........0........0
..1.2......1.2......1.2......1.2......1.2......1.2......1.2......1.2
..3.0.3....3.4.3....3.4.0....3.4.5....3.4.5....3.4.5....0.3.0....3.4.3
..4.2.5.2..5.1.5.2..0.5.6.3..1.6.0.4..6.7.3.2..2.0.2.1..1.4.2.3..5.6.7.6

Crossrefs

Sequence in context: A203696 A203530 A232594 * A211915 A182326 A370310

Adjacent sequences: A194790 A194791 A194792 * A194794 A194795 A194796

Keyword

nonn

Author

R. H. Hardin Sep 03 2011

Status

approved