A208784 Number of nX4 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any antidiagonal neighbor (colorings ignoring permutations of colors)

15, 2066, 1515903, 3038188519, 12766857248692, 96847533172181917, 1203020866861467699281, 22838542212752073231771562, 629327172247329940151800238149, 24181742478057901824056463340302417

Offset

1,1

Comments

Column 4 of A208788

Links

R. H. Hardin, Table of n, a(n) for n = 1..51

Example

Some solutions for n=4
..0..1..0..0....0..1..0..1....0..0..0..0....0..0..0..0....0..0..1..2
..0..1..1..1....2..1..0..0....1..1..1..0....1..1..1..0....1..0..0..0
..0..2..0..0....0..1..1..0....0..2..1..2....0..0..1..0....1..1..1..0
..0..1..1..0....0..3..1..0....0..2..0..0....1..0..1..0....0..2..1..0

Crossrefs

Sequence in context: A319623 A208875 A199098 * A126681 A263162 A232196

Adjacent sequences: A208781 A208782 A208783 * A208785 A208786 A208787

Keyword

nonn

Author

R. H. Hardin Mar 01 2012

Status

approved