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A153946 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 5 X 5 X 5 subtriangle. 0
1, 2, 2, 3, 4, 4, 8, 28, 30, 85, 295, 509, 1187, 7245, 11515, 45155, 251258, 668550, 2564348, 22927188, 58681071, 365101542, 3245521086, 13341587072, 79655532465, 1165655712148, 4589765439206, 44705564743713, 626481583312972 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..28.

CROSSREFS

Sequence in context: A036814 A137776 A262699 * A036810 A036809 A111263

Adjacent sequences:  A153943 A153944 A153945 * A153947 A153948 A153949

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified July 24 05:05 EDT 2021. Contains 346273 sequences. (Running on oeis4.)