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A153913
Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 2 ones in any 3 X 3 X 3 subtriangle.
0
1, 2, 26, 129, 122, 239, 1864, 1591, 5085, 36162, 47771, 138927, 1581118, 1910444, 8834202, 91938135, 174908406, 743306687, 12298725970, 21309347213, 143524473375, 2166989721589, 5956644162405, 36651705702510
(list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
Table of n, a(n) for n=0..23.
CROSSREFS
Sequence in context: A120551 A120547 A132470 * A246586 A067851 A072415
Adjacent sequences: A153910 A153911 A153912 * A153914 A153915 A153916
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2009
STATUS
approved

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Last modified November 16 22:15 EST 2024. Contains 377807 sequences.
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