A153903 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 4 X 4 X 4 subtriangle.

1, 2, 2, 3, 3, 7, 10, 21, 34, 88, 150, 421, 807, 2708, 6019, 22444, 58037, 245472, 706322, 3364913, 10967191, 59955069, 222028350, 1374087876, 5812458172, 40846719268, 195779164954, 1558347753536, 8466932734756, 76665491618022, 472779311230382

Offset

0,2

Links

Table of n, a(n) for n=0..30.

Crossrefs

Sequence in context: A241385 A307736 A309713 * A331729 A095741 A252582

Adjacent sequences: A153900 A153901 A153902 * A153904 A153905 A153906

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved