A301825 Number of 4Xn 0..1 arrays with every element equal to 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero.

0, 13, 8, 68, 299, 1351, 6653, 30441, 146175, 682879, 3234177, 15226483, 71859897, 338825989, 1598126524, 7536923120, 35546600366, 167645751951, 790663538862, 3728968861295, 17586797354805, 82943890400479, 391184964947659

Offset

1,2

Comments

Row 4 of A301823.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical recurrence of order 66

Formula

Empirical recurrence of order 66 (see link above)

Example

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

Crossrefs

Cf. A301823.

Sequence in context: A166522 A206610 A250031 * A300377 A300679 A304137

Adjacent sequences: A301822 A301823 A301824 * A301826 A301827 A301828

Keyword

nonn

Author

R. H. Hardin, Mar 27 2018

Status

approved