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A153925
Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 3 ones in any 4 X 4 X 4 subtriangle.
0
1, 2, 59, 113, 284, 518, 1796, 3449, 13001, 33157, 125582, 347073, 1750397, 4967495, 26187751, 100593004, 556134332, 2202434132, 16364033894, 67618894318, 527057394363, 2923317994023, 23673541188119, 137414022400841
OFFSET
0,2
CROSSREFS
Sequence in context: A215393 A141869 A329551 * A100273 A138982 A142666
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2009
STATUS
approved