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A153903 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 1 one in any 4 X 4 X 4 subtriangle. 0
1, 2, 2, 3, 3, 7, 10, 21, 34, 88, 150, 421, 807, 2708, 6019, 22444, 58037, 245472, 706322, 3364913, 10967191, 59955069, 222028350, 1374087876, 5812458172, 40846719268, 195779164954, 1558347753536, 8466932734756, 76665491618022, 472779311230382 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

CROSSREFS

Sequence in context: A241385 A307736 A309713 * A331729 A095741 A252582

Adjacent sequences:  A153900 A153901 A153902 * A153904 A153905 A153906

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified December 2 10:39 EST 2020. Contains 338876 sequences. (Running on oeis4.)