A301998 Number of nX7 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

8, 128, 1108, 10982, 122232, 1366374, 15243860, 169636124, 1884309898, 20919022400, 232254936138, 2579000358404, 28639373845122, 318037976285038, 3531770886607536, 39219734913406306, 435528277377832336

Offset

1,1

Comments

Column 7 of A301999.

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

Crossrefs

Cf. A301999.

Sequence in context: A302810 A061549 A303471 * A105094 A208711 A242355

Adjacent sequences: A301995 A301996 A301997 * A301999 A302000 A302001

Keyword

nonn

Author

R. H. Hardin, Mar 30 2018

Status

approved