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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.
0
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
CROSSREFS
Sequence in context: A084848 A342330 A358911 * A357710 A242971 A036818
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2009
STATUS
approved