A153964 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 8 ones in any 5 X 5 X 5 subtriangle.

1, 2, 2, 4, 6, 8, 17, 62, 97, 362, 1324, 3868, 13138, 92566, 270599, 1645369, 11553340, 61799175, 385381600, 4833634814, 26435310212, 299198500876, 3860046376506, 38367622605338, 439015544648715, 10375069938961300

Offset

0,2

Links

Table of n, a(n) for n=0..25.

Crossrefs

Sequence in context: A153958 A216214 A269298 * A001010 A357952 A091966

Adjacent sequences: A153961 A153962 A153963 * A153965 A153966 A153967

Keyword

nonn

Author

R. H. Hardin Jan 03 2009

Status

approved