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A296321 Number of nXn 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 neighboring 1s. 0
1, 3, 11, 61, 853, 20088, 850404, 72224019, 11207386103, 3245575984755, 1784744625714267, 1830394475306895557, 3517200566091635085954, 12698075318404649075573041, 85871949097296276009847589332 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A296327.

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A296327.

Sequence in context: A273468 A004108 A203007 * A203768 A069725 A291287

Adjacent sequences:  A296318 A296319 A296320 * A296322 A296323 A296324

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 10 2017

STATUS

approved

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Last modified February 27 06:36 EST 2020. Contains 332299 sequences. (Running on oeis4.)