A267333 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any southwest or northwest neighbors modulo 4 and the upper left element equal to 0.

6, 0, 0, 1, 22, 396, 2516, 10533, 33704, 92526, 369726, 2640466, 20643782, 138985920, 774999596, 3688265633, 16042197634, 71499663298, 364035498690, 2117882102632, 12817951753070, 74510126235424, 404088344721210, 2063669373837938

Offset

1,1

Comments

Row 4 of A267328.

Links

R. H. Hardin, Table of n, a(n) for n = 1..32

Example

Some solutions for n=6
..0..1..2..2..3..3....0..1..2..3..0..0....0..1..2..2..3..0....0..0..0..1..2..3
..0..1..1..2..3..0....0..1..2..3..3..0....1..1..2..3..3..0....3..0..1..1..2..3
..0..1..2..2..3..0....1..1..2..2..3..0....0..1..2..3..3..0....3..0..1..1..2..2
..1..1..2..3..3..0....1..1..2..2..3..3....1..1..2..2..3..0....3..0..1..2..2..3

Crossrefs

Cf. A267328.

Sequence in context: A372047 A325740 A222118 * A337885 A333204 A186978

Adjacent sequences: A267330 A267331 A267332 * A267334 A267335 A267336

Keyword

nonn

Author

R. H. Hardin, Jan 13 2016

Status

approved