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A269218
Number of 5Xn 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once.
1
0, 103488, 6712704, 474091776, 30541426560, 1910809190712, 116322554833728, 6948456736101264, 408916976890552416, 23782890276972969552, 1370013927382609217472, 78294173211595616892096
OFFSET
1,2
COMMENTS
Row 5 of A269214.
FORMULA
Empirical recurrence of order 52 (see link above)
EXAMPLE
Some solutions for n=2
..2..0. .0..1. .3..2. .2..2. .3..1. .2..0. .3..3. .3..3. .0..0. .1..0
..1..0. .1..1. .1..1. .2..0. .0..1. .2..3. .2..3. .0..1. .2..2. .2..3
..3..3. .1..3. .3..1. .2..3. .0..2. .3..0. .0..0. .0..2. .3..2. .3..3
..3..3. .2..2. .3..2. .1..3. .0..1. .2..2. .0..2. .0..1. .0..2. .1..0
..1..3. .2..2. .3..3. .2..1. .1..2. .3..2. .3..2. .1..1. .3..0. .0..1
CROSSREFS
Cf. A269214.
Sequence in context: A237572 A255210 A147526 * A237894 A171162 A235721
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 20 2016
STATUS
approved