A203493 Number of 3Xn 0..2 arrays with row sums equal and column sums unequal to adjacent columns

3, 36, 624, 9540, 170868, 3171708, 59683122, 1152091884, 22554305502, 446374660920, 8921216076156, 179685599410440, 3642895093030506, 74273800555695024, 1521731710882139544, 31310362607335978500

Offset

1,1

Comments

Row 3 of A203491

Links

R. H. Hardin, Table of n, a(n) for n = 1..50

Example

Some solutions for n=5
..2..1..2..1..1....0..2..2..2..0....2..2..1..0..0....2..0..1..2..1
..1..1..2..1..2....1..2..0..1..2....0..0..1..2..2....2..1..2..1..0
..2..1..1..1..2....2..1..0..2..1....0..1..2..0..2....2..1..1..2..0

Crossrefs

Sequence in context: A234869 A371660 A305991 * A296098 A224256 A223912

Adjacent sequences: A203490 A203491 A203492 * A203494 A203495 A203496

Keyword

nonn

Author

R. H. Hardin Jan 02 2012

Status

approved