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A280281
Number of nX4 0..2 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.
1
2, 384, 16860, 592416, 18844474, 566131860, 16393550046, 462579750172, 12805032188772, 349269067529316, 9415514952577460, 251409624519315024, 6660091714490230910, 175258485314498284648, 4585645730057094995818
OFFSET
1,1
COMMENTS
Column 4 of A280284.
LINKS
EXAMPLE
Some solutions for n=3
..0..1..2..0. .0..1..0..2. .0..1..2..0. .0..1..0..1. .0..1..2..0
..0..2..1..1. .0..1..1..2. .1..0..2..1. .2..2..0..2. .0..1..2..0
..0..1..0..0. .2..2..0..1. .1..1..0..1. .0..1..0..1. .2..1..0..1
CROSSREFS
Cf. A280284.
Sequence in context: A142532 A329555 A171431 * A225096 A225111 A343698
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 30 2016
STATUS
approved