A305907 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.

8, 28, 98, 396, 2075, 9140, 40412, 189729, 873060, 3979064, 18356703, 84632174, 389029015, 1791954662, 8257849953, 38030907288, 175204408009, 807291828371, 3719389877395, 17136993336823, 78962057731073, 363828807655049

Offset

1,1

Comments

Column 4 of A305911.

Links

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

R. H. Hardin, Empirical recurrence of order 69

Formula

Empirical recurrence of order 69 (see link above)

Example

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

Crossrefs

Cf. A305911.

Sequence in context: A095857 A184606 A054114 * A110687 A153365 A317149

Adjacent sequences: A305904 A305905 A305906 * A305908 A305909 A305910

Keyword

nonn

Author

R. H. Hardin, Jun 14 2018

Status

approved