A182070 Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal, diagonal or antidiagonal neighbor

1, 2, 35, 8292, 43324498, 7006657352045

Offset

1,2

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for n=4
..0........0........0........0........0........0........0........0
..0.1......1.2......1.2......1.2......1.2......1.2......1.2......0.1
..2.3.4....1.0.3....3.4.1....0.3.4....3.4.5....1.3.0....3.4.1....2.1.3
..1.3.4.2..1.4.1.4..2.4.5.3..1.3.1.2..5.4.5.2..4.3.1.2..5.0.1.5..0.1.2.0

Crossrefs

Sequence in context: A132100 A327129 A291809 * A325630 A292702 A133013

Adjacent sequences: A182067 A182068 A182069 * A182071 A182072 A182073

Keyword

nonn

Author

R. H. Hardin Apr 26 2012

Status

approved