A318210 Number of nX4 0..1 arrays with every element unequal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

2, 10, 21, 69, 245, 698, 2321, 7528, 24531, 80826, 263430, 865328, 2842893, 9337446, 30698901, 100854560, 331565806, 1089746855, 3582297494, 11775723803, 38708636705, 127247937304, 418290582504, 1375050737435, 4520146432969

Offset

1,1

Comments

Column 4 of A318214.

Links

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

Example

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

Crossrefs

Cf. A318214.

Sequence in context: A231376 A304700 A318548 * A080881 A138298 A303294

Adjacent sequences: A318207 A318208 A318209 * A318211 A318212 A318213

Keyword

nonn

Author

R. H. Hardin, Aug 21 2018

Status

approved