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Search: id:A153957
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A153957 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 7 ones in any 5 X 5 X 5 subtriangle. +0
1
1, 2, 4, 16, 56, 256, 1518, 15896, 171565, 3217779, 58858443, 1927799742, 63170771231, 3671078892600, 213376157401433, 21677971544137049 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A053498 A005388 A053503 this_sequence A068789 A009624 A009161

Adjacent sequences: A153954 A153955 A153956 this_sequence A153958 A153959 A153960

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jan 03 2009

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

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