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Search: id:A153998
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A153998 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 12 ones in any 5 X 5 X 5 subtriangle. +0
1
1, 2, 4, 16, 64, 499, 3953, 61786, 971846, 30167054, 945677765, 58569920903, 3661573089790, 452214656078450, 56362299453225220, 13875014401044838663, 3447151263100307142903, 1691594815727250621502922 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A138870 A153992 A153995 this_sequence A154001 A154004 A060656

Adjacent sequences: A153995 A153996 A153997 this_sequence A153999 A154000 A154001

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jan 04 2009

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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