A203033 Number of 3Xn 0..3 arrays with row sums equal and column sums unequal to adjacent columns.

4, 120, 4740, 191208, 8536230, 396419436, 18828234948, 912456343092, 44877327059082, 2232846723233916, 112156061708925570, 5678174300220035688, 289386692411558932884, 14832527343262783621824, 763984636989973669144320

Offset

1,1

Comments

Row 3 of A203031

Links

R. H. Hardin, Table of n, a(n) for n = 1..16

Example

Some.solutions.for.n=5
..2..3..0..3..2....1..2..0..0..3....3..2..3..3..2....2..0..1..1..0
..2..1..1..3..3....0..0..3..1..2....3..1..3..3..3....3..0..0..0..1
..3..1..2..1..3....3..0..2..0..1....3..2..2..3..3....1..0..0..1..2

Crossrefs

Sequence in context: A347425 A002702 A068204 * A395488 A307935 A395175

Adjacent sequences: A203030 A203031 A203032 * A203034 A203035 A203036

Keyword

nonn

Author

R. H. Hardin, Dec 27 2011

Status

approved