A209679 Number of n X n 0..4 arrays with every element equal to a diagonal or antidiagonal reflection, and new values 0 upwards introduced in row major order

1, 15, 1243, 2143147, 6713848491, 336865786047147, 29579506766774446763, 41557077253870074781674155, 102173227506131465827954312522411, 4019288788864555869108044364449353214635

Offset

1,2

Comments

Column 3 of A209684

Links

R. H. Hardin, Table of n, a(n) for n = 1..51

Example

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

Crossrefs

Sequence in context: A354385 A098723 A120296 * A135810 A273967 A273963

Adjacent sequences: A209676 A209677 A209678 * A209680 A209681 A209682

Keyword

nonn

Author

R. H. Hardin Mar 11 2012

Status

approved