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A216334 Number of horizontal and antidiagonal neighbor colorings of the even squares of an nX4 array with new integer colors introduced in row major order 1
1, 5, 42, 726, 15144, 502658, 18378580, 950376664, 52183667212, 3788883495864, 286529186194664, 27420871472654064, 2701657928740913416, 326508788572113365896, 40316833236311531705440, 5965422648942609379676752 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A216338

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..78

EXAMPLE

Some solutions for n=4

..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x

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

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

..x..1..x..2....x..0..x..1....x..0..x..3....x..5..x..3....x..1..x..4

CROSSREFS

Sequence in context: A336605 A204235 A188405 * A350930 A132487 A178614

Adjacent sequences:  A216331 A216332 A216333 * A216335 A216336 A216337

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 04 2012

STATUS

approved

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Last modified October 5 11:35 EDT 2022. Contains 357255 sequences. (Running on oeis4.)