A223969 Number of n X n 0..2 arrays with rows and antidiagonals unimodal

3, 81, 9515, 2558848, 1140963027, 715985189481, 574360426081996, 553932588795530549, 616038706732274614176, 766990732794703992309550, 1046181711135056928867576316, 1538264672813438079567996935803

Offset

1,1

Comments

Diagonal of A223975

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Sequence in context: A207222 A207007 A223783 * A207202 A206856 A206951

Adjacent sequences: A223966 A223967 A223968 * A223970 A223971 A223972

Keyword

nonn

Author

R. H. Hardin Mar 30 2013

Status

approved