A302822 Number of 4Xn 0..1 arrays with every element equal to 0, 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

8, 81, 389, 1494, 6905, 34957, 170262, 800847, 3803935, 18365102, 88560473, 424619869, 2035343158, 9777295419, 46988945099, 225666735042, 1083506611767, 5203510168649, 24992947298934, 120035845319593, 576475476282345

Offset

1,1

Comments

Row 4 of A302820.

Links

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

R. H. Hardin, Empirical recurrence of order 67

Formula

Empirical recurrence of order 67 (see link above)

Example

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

Crossrefs

Cf. A302820.

Sequence in context: A302325 A303018 A247536 * A303515 A027768 A236749

Adjacent sequences: A302819 A302820 A302821 * A302823 A302824 A302825

Keyword

nonn

Author

R. H. Hardin, Apr 13 2018

Status

approved