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A153551 Number of planar n X n X n binary triangular grids with no more than 2 ones in any similarly oriented 3 X 3 X 3 subtriangle. 0
1, 2, 7, 22, 138, 1319, 16363, 320308, 9347304, 395198881, 24967400825, 2338902316070, 323464731245071, 66313728025965398, 20135677790841925784, 9050070037089457390796, 6023866973628415403731955 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..16.

CROSSREFS

Sequence in context: A049369 A308548 A153523 * A125285 A170870 A122631

Adjacent sequences:  A153548 A153549 A153550 * A153552 A153553 A153554

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 01 2009

STATUS

approved

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Last modified August 26 00:35 EDT 2019. Contains 326324 sequences. (Running on oeis4.)