A296639 Number of nX4 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 1, 2 or 4 neighboring 1s.

7, 86, 671, 5696, 49872, 430522, 3713779, 32095222, 277299810, 2395400876, 20693860360, 178774685507, 1544423015390, 13342196998602, 115262678365111, 995749100272238, 8602231678929970, 74314295339427502, 641997874601748641

Offset

1,1

Comments

Column 4 of A296643.

Links

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

R. H. Hardin, Empirical recurrence of order 74

Formula

Empirical recurrence of order 74 (see link above)

Example

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

Crossrefs

Cf. A296643.

Sequence in context: A220246 A196257 A296382 * A220306 A344106 A346987

Adjacent sequences: A296636 A296637 A296638 * A296640 A296641 A296642

Keyword

nonn

Author

R. H. Hardin, Dec 17 2017

Status

approved