A267265 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north, northeast or northwest neighbors modulo 4 and the upper left element equal to 0.

1, 1, 1, 1, 1, 1, 1, 9, 87, 865, 7649, 61021, 458527, 3292439, 22907789, 155639305, 1038112235, 6824466823, 44346420219, 285480376511, 1823828784941, 11579358641469, 73141158203461, 460054937791477, 2883707639144059

Offset

1,8

Comments

Row 4 of A267264.

Links

R. H. Hardin, Table of n, a(n) for n = 1..31

Example

Some solutions for n=12
..0..1..1..2..2..2..3..2..3..3..0..0....0..0..3..0..0..1..1..2..2..2..2..1
..1..1..2..2..2..3..3..3..3..0..0..1....0..0..0..0..1..1..2..2..3..3..2..2
..1..2..2..2..3..3..0..0..0..0..1..1....1..0..0..1..1..2..2..3..3..3..3..3
..2..2..3..3..3..0..0..1..0..1..1..1....1..1..1..1..2..2..3..3..3..0..0..3

Crossrefs

Cf. A267264.

Sequence in context: A144852 A153191 A223277 * A152264 A035101 A351525

Adjacent sequences: A267262 A267263 A267264 * A267266 A267267 A267268

Keyword

nonn

Author

R. H. Hardin, Jan 12 2016

Status

approved