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.

1, 2, 3, 10, 29, 170, 866, 8938, 80759, 1473212, 23518209, 758000366, 21390884981, 1218501715162, 60770817102548, 6118061305466866, 539278173702963911, 95952596838569547200, 14947904300936965181323, 4700556597989635565249354

Offset

0,2

Links

Table of n, a(n) for n=0..19.

Crossrefs

Sequence in context: A371607 A338583 A121909 * A319189 A301971 A319671

Adjacent sequences: A153906 A153907 A153908 * A153910 A153911 A153912

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved