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A199145 Number of nX4 0..3 arrays with values 0..3 introduced in row major order and each element equal to one or two horizontal and vertical neighbors 1
2, 65, 2453, 125468, 6235011, 316561994, 15958823113, 806680624447, 40736752748774, 2057896226081573, 103945296750116087, 5250572116269762125, 265216743260845702081, 13396704712673136390007, 676696655003807234547723 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A199149

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A294179 A002604 A294273 * A198665 A185029 A228081

Adjacent sequences:  A199142 A199143 A199144 * A199146 A199147 A199148

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 03 2011

STATUS

approved

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Last modified November 29 14:50 EST 2021. Contains 349416 sequences. (Running on oeis4.)