A302530 Number of 4Xn 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

0, 23, 115, 168, 539, 1977, 5942, 16733, 49219, 159516, 493401, 1460747, 4425266, 13722727, 42140581, 127606254, 388561273, 1192422089, 3648989388, 11120119943, 33934405093, 103799531930, 317293759665, 968655453293, 2958170322080

Offset

1,2

Comments

Row 4 of A302528.

Links

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

R. H. Hardin, Empirical recurrence of order 68

Formula

Empirical recurrence of order 68 (see link above)

Example

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

Crossrefs

Cf. A302528.

Sequence in context: A070024 A111943 A057877 * A156568 A042026 A042028

Adjacent sequences: A302527 A302528 A302529 * A302531 A302532 A302533

Keyword

nonn

Author

R. H. Hardin, Apr 09 2018

Status

approved