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A198510 Number of 2n X 6 0..4 arrays with values 0..4 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors. 0
1626, 308854, 59007820, 13127875861, 3023133941944, 714429326523241, 171400320611391344, 41515521989152410680, 10116919781533608842706, 2474972835936834280715447 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A198511.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4:

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

..2..1..1..1..1..2....2..1..1..1..1..2....2..1..1..1..1..2....2..1..1..1..1..3

..2..0..0..0..0..2....2..0..0..0..0..2....2..0..0..0..0..2....2..0..0..0..0..3

..0..0..3..3..0..4....0..0..1..1..0..3....0..0..2..2..0..3....0..0..4..4..0..4

..1..1..3..3..0..4....2..2..1..1..0..3....1..1..2..2..0..3....1..1..4..4..0..4

..2..1..4..4..0..0....4..2..3..3..0..0....0..1..4..4..0..0....2..1..2..2..0..0

..2..1..4..4..1..1....4..2..3..3..1..1....0..1..4..4..3..3....2..1..2..2..3..3

..0..1..2..2..1..0....1..2..4..4..1..0....3..1..2..2..3..2....0..1..4..4..3..0

CROSSREFS

Cf. A198511.

Sequence in context: A097225 A345968 A186846 * A241493 A328452 A202985

Adjacent sequences: A198507 A198508 A198509 * A198511 A198512 A198513

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 25 2011

STATUS

approved

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Last modified November 28 05:56 EST 2022. Contains 358407 sequences. (Running on oeis4.)