A281329 Number of 4 X n 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.

0, 304, 27144, 953236, 31906806, 977717308, 28739292730, 819460734096, 22863636278820, 627462391921784, 16998237537647454, 455708712521193672, 12112703985140255876, 319648041131418167054, 8383975282118464984646

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