A299245 Number of nX4 0..1 arrays with every element equal to 0, 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 18, 18, 55, 192, 652, 2002, 6741, 23631, 79836, 274822, 954282, 3306096, 11462662, 39849725, 138545796, 481560761, 1674865229, 5826326576, 20267377567, 70508970351, 245315398653, 853512851244, 2969629901018, 10332484940737

Offset

1,2

Comments

Column 4 of A299249.

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..1..0. .0..0..1..1. .0..0..1..1. .0..1..1..1. .0..1..1..0
..0..0..1..1. .0..0..1..1. .1..0..1..0. .0..0..1..0. .0..0..1..1
..1..1..1..0. .0..0..1..1. .1..1..0..0. .0..1..1..1. .1..1..0..1
..0..1..1..1. .1..1..1..1. .0..1..1..1. .1..1..1..0. .0..1..0..0
..1..1..0..1. .1..1..1..1. .1..1..0..1. .1..0..1..1. .1..1..1..0

Crossrefs

Cf. A299249.

Sequence in context: A022352 A211411 A298378 * A352365 A050686 A165839

Adjacent sequences: A299242 A299243 A299244 * A299246 A299247 A299248

Keyword

nonn

Author

R. H. Hardin, Feb 05 2018

Status

approved