A153925 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 3 ones in any 4 X 4 X 4 subtriangle.

1, 2, 59, 113, 284, 518, 1796, 3449, 13001, 33157, 125582, 347073, 1750397, 4967495, 26187751, 100593004, 556134332, 2202434132, 16364033894, 67618894318, 527057394363, 2923317994023, 23673541188119, 137414022400841

Offset

0,2

Links

Table of n, a(n) for n=0..23.

Crossrefs

Sequence in context: A215393 A141869 A329551 * A100273 A138982 A142666

Adjacent sequences: A153922 A153923 A153924 * A153926 A153927 A153928

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved