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A154002 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 13 ones in any 5 X 5 X 5 subtriangle. 0
1, 2, 2, 4, 8, 15, 30, 121, 231, 922, 3737, 14596, 58211, 469831, 1835827, 14554240, 117947573, 917117580, 7292920219, 117680064956, 918073021793, 14535229309434, 235458669342831, 3657602835082750, 58133874029508411, 1875022386576869767 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Sequence in context: A098788 A190820 A153999 * A154005 A054243 A005864

Adjacent sequences:  A153999 A154000 A154001 * A154003 A154004 A154005

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Jan 04 2009

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Last modified February 16 10:07 EST 2012. Contains 205904 sequences.