A266826 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west, northwest or southwest neighbor modulo 3 and the upper left element equal to 0.

1, 0, 1, 4, 10, 25, 45, 120, 399, 1108, 2923, 7991, 21953, 61747, 176646, 499952, 1409762, 3999661, 11391786, 32574598, 93459471, 268336007, 771070140, 2219952037, 6403510478, 18502345737, 53538515559, 155090741041, 449731074131

Offset

1,4

Comments

Row 3 of A266825.

Links

R. H. Hardin, Table of n, a(n) for n = 1..105

Example

All solutions for n=4
..0..2..1..1....0..2..2..1....0..0..2..1....0..2..1..0
..0..2..1..0....0..2..1..1....0..2..2..1....2..2..1..0
..2..2..1..0....0..2..1..0....0..2..1..1....2..1..1..0

Crossrefs

Cf. A266825.

Sequence in context: A111153 A265438 A145368 * A111207 A298018 A254233

Adjacent sequences: A266823 A266824 A266825 * A266827 A266828 A266829

Keyword

nonn

Author

R. H. Hardin, Jan 04 2016

Status

approved