A216334 - OEIS

A216334

Number of horizontal and antidiagonal neighbor colorings of the even squares of an n X 4 array with new integer colors introduced in row major order.

1, 5, 42, 726, 15144, 502658, 18378580, 950376664, 52183667212, 3788883495864, 286529186194664, 27420871472654064, 2701657928740913416, 326508788572113365896, 40316833236311531705440, 5965422648942609379676752, 897057171450298448594594368, 158723597386944654236759074832

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

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

Column 4 of A216338.

Sequence in context: A336605 A204235 A188405 * A374067 A350930 A368352

Adjacent sequences: A216331 A216332 A216333 * A216335 A216336 A216337

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 04 2012

STATUS

approved