A302524 Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

2, 10, 42, 168, 902, 3256, 15852, 77904, 314276, 1506894, 7035934, 30537794, 143024948, 655833426, 2937151450, 13568476862, 61920768478, 280707441628, 1287994621032, 5873565899442, 26746065104754, 122342967545180

Offset

1,1

Comments

Column 4 of A302528.

Links

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

R. H. Hardin, Empirical recurrence of order 72

Formula

Empirical recurrence of order 72 (see link above)

Example

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

Crossrefs

Cf. A302528.

Sequence in context: A181052 A024483 A276666 * A084180 A020988 A177238

Adjacent sequences: A302521 A302522 A302523 * A302525 A302526 A302527

Keyword

nonn

Author

R. H. Hardin, Apr 09 2018

Status

approved