A216456 - OEIS

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A216456

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

1, 1, 7, 203, 580479, 6423127757, 22530453266592757

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

OFFSET

1,3

COMMENTS

Diagonal of A216460

LINKS

Table of n, a(n) for n=1..7.

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..3....x..2..x..3....x..2..x..3....x..2..x..3....x..2..x..3