A153937 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 4 ones in any 5 X 5 X 5 subtriangle.

1, 2, 2, 3, 4, 4, 7, 20, 21, 45, 145, 212, 436, 2161, 2791, 8995, 40480, 86264, 264562, 1826697, 3632340, 16824438, 112933447, 337629371, 1472886340, 15531543956, 43332027600, 293975081405, 2889767925722, 12600532736321, 79696537663155

Offset

0,2

Links

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

Crossrefs

Sequence in context: A084848 A342330 A358911 * A357710 A242971 A036818

Adjacent sequences: A153934 A153935 A153936 * A153938 A153939 A153940

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved