A153900 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 1 one in any 3 X 3 X 3 subtriangle.

1, 2, 2, 3, 5, 10, 18, 48, 97, 299, 769, 2879, 9061, 41454, 154622, 857522, 3902066, 26137942, 144826739, 1177942368, 7878440446, 77715100928, 630332738835, 7530329483705, 74116147914872, 1073536700395590, 12799994974031763

Offset

0,2

Links

Table of n, a(n) for n=0..26.

Crossrefs

Sequence in context: A360299 A344708 A322113 * A049873 A127180 A317809

Adjacent sequences: A153897 A153898 A153899 * A153901 A153902 A153903

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved