A223054 Number of 3Xn 0..3 arrays with exactly floor(3Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order

0, 32, 1682, 95648, 3760845, 225200914, 8981996365, 555681741893, 22385476818439, 1411431030197268, 57210083819337309, 3652301054192073142, 148668908783460133336, 9574830993089261328274, 390958259282559073567108

Offset

1,2

Comments

Row 3 of A223052

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

Some solutions for n=3
..0..0..1....0..1..1....0..1..0....0..0..1....0..1..2....0..1..2....0..1..2
..2..1..2....2..3..1....2..1..0....2..0..0....3..0..0....3..3..3....1..2..3
..0..1..2....0..1..0....1..3..3....2..3..1....3..0..3....0..2..3....0..2..1

Crossrefs

Sequence in context: A333603 A264074 A264187 * A183242 A186019 A186011

Adjacent sequences: A223051 A223052 A223053 * A223055 A223056 A223057

Keyword

nonn

Author

R. H. Hardin Mar 13 2013

Status

approved