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A216465 Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of a 7Xn array with new integer colors introduced in row major order 0
15, 203, 36401, 4213597, 8195008751, 3376465219485, 22530453266592757, 20538493137072741201 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A216460

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..2..x..0....x..2..x..0....x..2..x..0....x..2..x..0....x..2..x..0

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

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

..5..x..0..x....4..x..5..x....1..x..4..x....1..x..5..x....1..x..5..x

..x..3..x..2....x..6..x..3....x..0..x..1....x..6..x..4....x..4..x..1

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

CROSSREFS

Sequence in context: A178507 A012566 A238992 * A215903 A070968 A075280

Adjacent sequences:  A216462 A216463 A216464 * A216466 A216467 A216468

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 07 2012

STATUS

approved

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Last modified October 23 02:26 EDT 2020. Contains 337962 sequences. (Running on oeis4.)