A209681 Number of n X n 0..6 arrays with every element equal to a diagonal or antidiagonal reflection, and new values 0 upwards introduced in row major order.

1, 15, 1549, 11315839, 268997909000, 250057183645608263, 431066310742284246294717, 26767947592293738225917871688575, 3047486118401281699024754722202652309976

Offset

1,2

Comments

Column 5 of A209684

Links

R. H. Hardin, Table of n, a(n) for n = 1..46

Example

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

Crossrefs

Sequence in context: A119784 A199228 A344638 * A209682 A209683 A249964

Adjacent sequences: A209678 A209679 A209680 * A209682 A209683 A209684

Keyword

nonn

Author

R. H. Hardin, Mar 11 2012

Status

approved