A153468 1/5 of the number of 5-colorings of a planar n X n X n triangular grid.

1, 12, 324, 19764, 2727756, 852196788, 602756140068, 965229960414132, 3499562183624643780, 28727144381588600187612, 533909545388896809071238444, 22466716989986988610061264294004, 2140465899840618529308907998923768676

Offset

1,2

Links

Table of n, a(n) for n=1..13.

Crossrefs

5th row of A182797/5.

Sequence in context: A288032 A365280 A080141 * A230817 A379347 A298245

Adjacent sequences: A153465 A153466 A153467 * A153469 A153470 A153471

Keyword

nonn

Author

R. H. Hardin, Dec 27 2008

Extensions

a(10)-a(11) from Alois P. Heinz, Dec 03 2010

a(12)-a(13) from Alois P. Heinz, Jul 21 2011

Status

approved