Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 2 X 2 X 2 subtriangle.

A153908

Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 2 X 2 X 2 subtriangle.

Terms

    a(0) =1a(1) =2a(2) =1a(3) =2a(4) =13a(5) =14a(6) =44a(7) =452a(8) =799a(9) =4626a(10) =86710a(11) =273752a(12) =2781435a(13) =91537826a(14) =508729354a(15) =9157300668a(16) =533484637064

External references