A266834 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, west or northwest neighbor modulo 4 and the upper left element equal to 0.

2, 11, 95, 1267, 19605, 322100, 5798969, 109094449, 2137890119, 42723425901, 870452405353, 17947494617157, 374336019053969, 7871123322669134, 166752702383416172, 3553681134317844777, 76147251272709529075

Offset

1,1

Comments

Row 4 of A266832.

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

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

Crossrefs

Cf. A266832.

Sequence in context: A292916 A290586 A098621 * A131407 A197994 A186273

Adjacent sequences: A266831 A266832 A266833 * A266835 A266836 A266837

Keyword

nonn

Author

R. H. Hardin, Jan 04 2016

Status

approved