A212945 Number of 3Xn 0..n-1 arrays with no column j greater than or equal to than column j-1 in all rows

1, 37, 9019, 6470341, 10058484751, 28744943858947, 135992452878101359, 989783189762563737541, 10495013926448689085587447, 155433527883236057504375249287, 3109085470816411449764436167502547

Offset

1,2

Comments

Row 3 of A212943

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

Some solutions for n=4
..2..1..2..3....2..2..0..2....1..1..2..0....1..0..3..2....1..0..0..3
..0..1..2..0....2..1..1..0....2..2..1..0....2..1..2..1....0..0..1..1
..0..1..0..2....1..1..2..2....3..2..2..0....1..3..2..0....1..3..1..0

Crossrefs

Sequence in context: A083117 A352467 A219001 * A220811 A129055 A193158

Adjacent sequences: A212942 A212943 A212944 * A212946 A212947 A212948

Keyword

nonn

Author

R. H. Hardin May 31 2012

Status

approved