A303411 Number of 4Xn 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

0, 23, 119, 168, 547, 2079, 6322, 17903, 53665, 177334, 555813, 1667489, 5141358, 16219859, 50536643, 155427826, 481370601, 1501569819, 4667505936, 14454412939, 44845109069, 139426950850, 433097541907, 1343835090319, 4171764326604

Offset

1,2

Comments

Row 4 of A303410.

Links

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

R. H. Hardin, Empirical recurrence of order 71

Formula

Empirical recurrence of order 71 (see link above)

Example

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

Crossrefs

Cf. A303410.

Sequence in context: A042028 A265982 A253679 * A069756 A351905 A337751

Adjacent sequences: A303408 A303409 A303410 * A303412 A303413 A303414

Keyword

nonn

Author

R. H. Hardin, Apr 23 2018

Status

approved