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A216331 Number of horizontal and antidiagonal neighbor colorings of the even squares of an n X n array with new integer colors introduced in row major order 0
1, 2, 15, 726, 2387180, 37060650272, 148049849072167133, 2765650089185458968363718 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A216338

LINKS

Table of n, a(n) for n=1..8.

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

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

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

CROSSREFS

Sequence in context: A208051 A038017 A012993 * A179432 A007542 A090604

Adjacent sequences:  A216328 A216329 A216330 * A216332 A216333 A216334

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 04 2012

STATUS

approved

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Last modified June 15 16:13 EDT 2019. Contains 324142 sequences. (Running on oeis4.)