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.

1, 1, 2, 2, 5, 11, 37, 100, 493, 1878, 13284, 74395, 745275, 5833759, 83605003, 936808185, 19121040653, 305862769758, 8892563071671, 202363258898765, 8388963351859194, 272273853161584435, 16084335957849229172

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