A153550 Number of planar n X n X n binary triangular grids with no more than 1 one in any 3 X 3 X 3 subtriangle.

1, 2, 4, 7, 21, 76, 276, 1348, 8261, 57523, 494123, 5241083, 66302797, 1017030742, 19028971842, 430245073504, 11780079516040, 391601126619884, 15773508409281591, 769806377138722292, 45555272775339596310

Offset

0,2

Links

Table of n, a(n) for n=0..20.

Crossrefs

Sequence in context: A237759 A306978 A337062 * A102984 A103017 A091833

Adjacent sequences: A153547 A153548 A153549 * A153551 A153552 A153553

Keyword

nonn

Author

R. H. Hardin, Jan 01 2009

Status

approved