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A281329 Number of 4Xn 0..2 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards. 1
0, 304, 27144, 953236, 31906806, 977717308, 28739292730, 819460734096, 22863636278820, 627462391921784, 16998237537647454, 455708712521193672, 12112703985140255876, 319648041131418167054, 8383975282118464984646 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A281326.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..166

EXAMPLE

Some solutions for n=3

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

..0..1..2. .1..1..0. .1..2..1. .2..0..2. .2..2..0. .1..2..1. .0..0..0

..2..2..1. .2..1..0. .1..1..2. .1..2..1. .0..0..0. .0..2..1. .0..2..0

..1..2..1. .0..2..2. .1..2..0. .1..1..1. .2..2..1. .1..2..1. .1..2..0

CROSSREFS

Cf. A281326.

Sequence in context: A300922 A301530 A172228 * A293092 A221117 A216260

Adjacent sequences:  A281326 A281327 A281328 * A281330 A281331 A281332

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 20 2017

STATUS

approved

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Last modified June 16 12:38 EDT 2019. Contains 324152 sequences. (Running on oeis4.)