A208299 Number of n X 5 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or antidiagonal neighbor (colorings ignoring permutations of colors).

1, 15, 12840, 87852626, 2227156082842, 148049849095504726, 21183598567292002167082, 5737167377815628378510929822, 2685975192008614716088213333413834, 2031667423243870021802621888823332638846, 2356075680798443401764258655433216618467066594

Offset

0,2

Links

Andrew Howroyd, Table of n, a(n) for n = 0..100

Example

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

Crossrefs

Column 5 of A208301.

Sequence in context: A271404 A271405 A271406 * A282945 A112614 A238634

Adjacent sequences: A208296 A208297 A208298 * A208300 A208301 A208302

Keyword

nonn

Author

R. H. Hardin, Feb 25 2012

Extensions

a(0)=1 prepended and terms a(10) and beyond from Andrew Howroyd, May 18 2020

Status

approved