A153467 1/4 of the number of 4-colorings of a planar n X n X n triangular grid.

1, 6, 48, 528, 8160, 179520, 5666304, 257819136, 16962407424, 1617060046848, 223709857824768, 44962767953608704, 13140310268741124096, 5587767779596757434368, 3459297434976642415460352

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Crossrefs

4th row of A182797/4, A182798/4.

Sequence in context: A351340 A368323 A002170 * A354750 A209670 A223270

Adjacent sequences: A153464 A153465 A153466 * A153468 A153469 A153470

Keyword

nonn

Author

R. H. Hardin, Dec 27 2008

Extensions

a(14) from Alois P. Heinz, Dec 03 2010

a(15) from Alois P. Heinz, Mar 11 2016

Status

approved