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Search: id:A153983
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A153983 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with every one adjacent to exactly 1 other one. +0
1
1, 1, 2, 2, 5, 11, 37, 100, 493, 1878, 13284, 74395, 745275, 5833759, 83605003, 936808185, 19121040653, 305862769758, 8892563071671, 202363258898765, 8388963351859194, 272273853161584435, 16084335957849229172 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A109278 A112527 A049680 this_sequence A058021 A152445 A077182

Adjacent sequences: A153980 A153981 A153982 this_sequence A153984 A153985 A153986

KEYWORD

nonn

AUTHOR

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

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

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