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A267904 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to at least one horizontal or vertical neighbor and the top left element equal to 0. 0
0, 30, 138, 17658, 414138, 28493946, 1246334388, 72638390592, 3823498828854, 218021286182580 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A267901.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A267901.

Sequence in context: A348828 A158462 A064495 * A218407 A347222 A229450

Adjacent sequences: A267901 A267902 A267903 * A267905 A267906 A267907

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 22 2016

STATUS

approved

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Last modified January 28 18:12 EST 2023. Contains 359895 sequences. (Running on oeis4.)