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A153943 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 5 ones in any 4 X 4 X 4 subtriangle. 0
1, 2, 2, 3, 4, 8, 14, 49, 79, 253, 741, 2335, 6399, 37905, 102246, 593203, 2884877, 16569870, 80670284, 832584915, 3998999249, 40528587997, 352270529241, 3516190442125, 29997079375598, 543310308646601, 4559849026688799 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..26.

CROSSREFS

Sequence in context: A147558 A032243 A153922 * A049309 A239967 A307891

Adjacent sequences:  A153940 A153941 A153942 * A153944 A153945 A153946

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified June 21 06:55 EDT 2021. Contains 345358 sequences. (Running on oeis4.)