A301883 Number of nX7 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.

21, 154, 823, 5463, 33853, 223869, 1454613, 9620565, 63336647, 419113710, 2770472419, 18336620495, 121358670826, 803332031961, 5318434541385, 35208666237989, 233111781026276, 1543314708909090, 10218090869079319

Offset

1,1

Comments

Column 7 of A301884.

Links

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

R. H. Hardin, Empirical recurrence of order 52

Formula

Empirical recurrence of order 52 (see link above)

Example

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

Crossrefs

Cf. A301884.

Sequence in context: A184376 A184368 A078396 * A302080 A331528 A180374

Adjacent sequences: A301880 A301881 A301882 * A301884 A301885 A301886

Keyword

nonn

Author

R. H. Hardin, Mar 28 2018

Status

approved