A317454 Number of nX4 0..1 arrays with every element unequal to 1, 2, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

2, 10, 36, 72, 353, 1525, 5601, 20603, 93180, 376067, 1440298, 6219533, 25449350, 101546963, 425583385, 1746282597, 7098263711, 29371457881, 120619016253, 493714118241, 2033241533001, 8352126707843, 34269831877530, 140900257953996

Offset

1,1

Comments

Column 4 of A317458.

Links

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

R. H. Hardin, Empirical recurrence of order 64

Formula

Empirical recurrence of order 64 (see link above)

Example

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

Crossrefs

Cf. A317458.

Sequence in context: A140954 A309889 A155894 * A244715 A212573 A100535

Adjacent sequences: A317451 A317452 A317453 * A317455 A317456 A317457

Keyword

nonn

Author

R. H. Hardin, Jul 28 2018

Status

approved