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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
1, 2, 5, 15, 61, 350, 2437, 18530, 145263, 1156222, 9288411, 75111303, 610606621, 4987797081, 40929379643, 337321631621, 2791500307920, 23190727949125, 193361664061657, 1617714495430036, 13577128985320094, 114285836177458835 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 30 03:02 EDT 2022. Contains 357095 sequences. (Running on oeis4.)