A209683 Number of n X n 0..8 arrays with every element equal to a diagonal or antidiagonal reflection, and new values 0 upwards introduced in row major order.

1, 15, 1551, 14164693, 847881355388, 5219870359015849505, 70570762532647014868797563, 62256944108221643391817947390337742, 103256072887229091159525820942838733556042886

Offset

1,2

Comments

Column 7 of A209684

Links

R. H. Hardin, Table of n, a(n) for n = 1..43

Example

Some solutions for n=3
..0..1..0....0..1..2....0..1..1....0..1..1....0..1..2....0..1..0....0..1..1
..2..1..1....3..3..1....1..2..0....2..2..1....1..3..3....1..2..2....0..1..1
..2..2..0....3..3..1....1..0..1....2..2..0....2..3..0....3..2..0....0..0..0

Crossrefs

Sequence in context: A344638 A209681 A209682 * A249964 A281801 A208000

Adjacent sequences: A209680 A209681 A209682 * A209684 A209685 A209686

Keyword

nonn

Author

R. H. Hardin, Mar 11 2012

Status

approved