A267558 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north or northeast neighbors modulo 4 and the upper left element equal to 0.

1, 2, 5, 15, 61, 350, 2437, 18530, 145263, 1156222, 9288411, 75111303, 610606621, 4987797081, 40929379643, 337321631621, 2791500307920, 23190727949125, 193361664061657, 1617714495430036, 13577128985320094, 114285836177458835

Offset

1,2

Comments

Row 4 of A267553.

Links

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

Example

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

Crossrefs

Cf. A267553.

Sequence in context: A030884 A030878 A030860 * A030852 A030840 A030829

Adjacent sequences: A267555 A267556 A267557 * A267559 A267560 A267561

Keyword

nonn

Author

R. H. Hardin, Jan 17 2016

Status

approved