A153472 1/9 of the number of 9-colorings of a planar n X n X n triangular grid.

1, 56, 19208, 40356008, 519359253560, 40941262367510120, 19769162164304264642504, 58472138404795144043227508456, 1059359506545823729966428034297457864, 117563210619769003021098235186555283816605208

Offset

1,2

Links

Table of n, a(n) for n=1..10.

Crossrefs

9th row of A182797/9.

Sequence in context: A158362 A227053 A115469 * A202579 A090218 A184897

Adjacent sequences: A153469 A153470 A153471 * A153473 A153474 A153475

Keyword

nonn

Author

R. H. Hardin, Dec 27 2008

Extensions

a(8)-a(10) from Alois P. Heinz, Dec 03 2010

Status

approved