A153917 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 5 X 5 X 5 subtriangle.

1, 2, 1, 1, 2, 1, 4, 13, 18, 49, 140, 188, 406, 1769, 3341, 8622, 44447, 84993, 281707, 1724133, 3711938, 16716005, 125407513, 356014822, 1906068709, 17144172762, 59257809503, 359265884506, 3898069443043

Offset

0,2

Links

Table of n, a(n) for n=0..28.

Crossrefs

Sequence in context: A057593 A117008 A337366 * A326407 A126127 A230324

Adjacent sequences: A153914 A153915 A153916 * A153918 A153919 A153920

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved