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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, 2, 2, 5, 11, 37, 100, 493, 1878, 13284, 74395, 745275, 5833759, 83605003, 936808185, 19121040653, 305862769758, 8892563071671, 202363258898765, 8388963351859194, 272273853161584435, 16084335957849229172 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..22.

CROSSREFS

Sequence in context: A216642 A227999 A049680 * A262714 A058021 A152445

Adjacent sequences:  A153980 A153981 A153982 * A153984 A153985 A153986

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified May 19 21:29 EDT 2019. Contains 323410 sequences. (Running on oeis4.)