A194792 Number of lower triangles of an (n+1)X(n+1) 0..6 array with new values introduced in row major order 0..6 and no element equal to any horizontal, diagonal, antidiagonal or vertical neighbor

1, 10, 1530, 1587724, 6012771932, 76835222989340, 3302081001560127592, 477232970093526846547868, 231946991234978104864701810980, 379107829075672054750390251800219732

Offset

1,2

Comments

Column 6 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
..0.3.0....3.4.5....3.4.5....3.0.4....3.4.0....3.4.5....3.4.1....3.4.5
..1.4.2.4..1.6.3.4..0.2.3.0..4.1.3.0..5.6.2.6..1.6.0.2..5.6.3.6..6.0.1.2

Crossrefs

Sequence in context: A361495 A370678 A211914 * A133216 A099128 A172958

Adjacent sequences: A194789 A194790 A194791 * A194793 A194794 A194795

Keyword

nonn

Author

R. H. Hardin Sep 03 2011

Status

approved