A153985 Number of planar n X n X n binary triangular grids with every one adjacent to exactly 1 other one.

1, 1, 4, 10, 45, 327, 2795, 37386, 708255, 18674478, 714577926, 38756649867, 2991760323799, 329930606705391, 51795338953514297, 11590318613952416039, 3697221054959107433421, 1680594967102679237735428

Offset

0,3

Links

Table of n, a(n) for n=0..17.

Crossrefs

Sequence in context: A155237 A155223 A155219 * A184481 A149227 A149228

Adjacent sequences: A153982 A153983 A153984 * A153986 A153987 A153988

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved