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A209682 Number of n X n 0..7 arrays with every element equal to a diagonal or antidiagonal reflection, and new values 0 upwards introduced in row major order 1
1, 15, 1551, 13575355, 584728215424, 1568091719977974635, 8230385298024619110939311, 2126394147054521999411737472214659, 1020701618427502395624813185662022237910866 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A209684

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..44

EXAMPLE

Some solutions for n=3

..0..0..1....0..0..1....0..0..0....0..1..0....0..1..0....0..1..0....0..0..0

..2..0..0....0..1..1....0..1..2....2..1..1....1..0..2....2..1..1....1..1..0

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

CROSSREFS

Sequence in context: A119784 A199228 A209681 * A209683 A249964 A281801

Adjacent sequences:  A209679 A209680 A209681 * A209683 A209684 A209685

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 11 2012

STATUS

approved

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Last modified October 18 23:01 EDT 2019. Contains 328211 sequences. (Running on oeis4.)