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, 15, 1551, 13575355, 584728215424, 1568091719977974635, 8230385298024619110939311, 2126394147054521999411737472214659, 1020701618427502395624813185662022237910866

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: A199228 A344638 A209681 * A209683 A249964 A281801

Adjacent sequences: A209679 A209680 A209681 * A209683 A209684 A209685

Keyword

nonn

Author

R. H. Hardin Mar 11 2012

Status

approved