A302169 Number of 7Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

64, 86, 111, 361, 621, 1563, 2853, 7306, 12963, 33522, 61775, 157788, 293072, 746806, 1414502, 3560709, 6821117, 17041351, 33109869, 81878009, 160823108, 394307941, 783258522, 1903510955, 3817195020, 9202579162, 18623741941, 44557228577

Offset

1,1

Comments

Row 7 of A302163.

Links

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

R. H. Hardin, Empirical recurrence of order 80

Formula

Empirical recurrence of order 80 (see link above)

Example

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

Crossrefs

Cf. A302163.

Sequence in context: A141817 A008435 A223083 * A302640 A302432 A303202

Adjacent sequences: A302166 A302167 A302168 * A302170 A302171 A302172

Keyword

nonn

Author

R. H. Hardin, Apr 02 2018

Status

approved