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A296398 Number of nXn 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 3 neighboring 1s. 0
1, 4, 24, 444, 35561, 6200926, 3068113721, 4427644444522, 16720185055951726, 174611744359086830290, 5039863866276836681199376 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A296405.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A296405.

Sequence in context: A247737 A326871 A012945 * A166947 A103624 A101952

Adjacent sequences:  A296395 A296396 A296397 * A296399 A296400 A296401

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 11 2017

STATUS

approved

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Last modified August 24 16:16 EDT 2019. Contains 326295 sequences. (Running on oeis4.)