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A268892 Number of 7Xn binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once. 1
0, 2285, 60666, 1706732, 39670270, 911930096, 19876401224, 426591159751, 8952723005030, 185650834624156, 3802871585155968, 77225962585267472, 1555913690406127580, 31149964203775581289, 620153220846869863058 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 7 of A268886.

LINKS

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

R. H. Hardin, Empirical recurrence of order 68

FORMULA

Empirical recurrence of order 68 (see link above)

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

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

CROSSREFS

Cf. A268886.

Sequence in context: A247401 A264256 A236700 * A206663 A247990 A206103

Adjacent sequences:  A268889 A268890 A268891 * A268893 A268894 A268895

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 15 2016

STATUS

approved

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Last modified June 18 20:45 EDT 2021. Contains 345121 sequences. (Running on oeis4.)