A266923 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, southwest or southeast neighbor modulo 4 and the upper left element equal to 0.

2, 23, 376, 7137, 147378, 3267167, 75854154, 1829256370, 45273247748, 1145456541787, 29456215803420, 768195833428293, 20256437927385064, 539323068676734715, 14474594537260948272, 391230710374639508192

Offset

1,1

Comments

Row 4 of A266921.

Links

R. H. Hardin, Table of n, a(n) for n = 1..20

Example

Some solutions for n=5
..0..2..0..2..0....0..1..2..1..3....0..2..0..1..3....0..3..1..2..3
..3..0..2..0..2....2..0..2..0..1....0..2..3..1..3....0..1..3..1..2
..2..3..1..3..1....1..3..2..3..0....3..0..2..1..2....3..1..2..0..2
..1..3..1..3..1....1..3..0..2..3....1..3..1..0..2....2..3..1..0..0

Crossrefs

Cf. A266921.

Sequence in context: A197740 A234868 A239109 * A060941 A338178 A219890

Adjacent sequences: A266920 A266921 A266922 * A266924 A266925 A266926

Keyword

nonn

Author

R. H. Hardin, Jan 06 2016

Status

approved