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A153909 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 2 ones in any 2 X 2 X 2 subtriangle. 0
1, 2, 3, 10, 29, 170, 866, 8938, 80759, 1473212, 23518209, 758000366, 21390884981, 1218501715162, 60770817102548, 6118061305466866, 539278173702963911, 95952596838569547200, 14947904300936965181323, 4700556597989635565249354 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Sequence in context: A034324 A084380 A121909 * A131764 A066706 A080022

Adjacent sequences:  A153906 A153907 A153908 * A153910 A153911 A153912

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Jan 03 2009

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Last modified February 16 19:01 EST 2012. Contains 205939 sequences.