

A297400


Number of 7Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 neighboring 1.


1



1, 178, 963, 3924, 74736, 640562, 4279111, 46261441, 428200086, 3465586864, 32328050104, 296748190460, 2574529121380, 23200388627087, 210159449303417, 1865437561436124, 16702908801335717, 150242351184841826
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OFFSET

1,2


COMMENTS

Row 7 of A297395.


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


CROSSREFS

Cf. A297395.
Sequence in context: A217037 A224600 A279093 * A297600 A296824 A297588
Adjacent sequences: A297397 A297398 A297399 * A297401 A297402 A297403


KEYWORD

nonn


AUTHOR

R. H. Hardin, Dec 29 2017


STATUS

approved



