Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 12 ones in any 5 X 5 X 5 subtriangle.

A153997

Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 12 ones in any 5 X 5 X 5 subtriangle.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =4a(4) =16a(5) =31a(6) =122a(7) =973a(8) =3890a(9) =30317a(10) =486144a(11) =3845485a(12) =61098761a(13) =1952652536a(14) =30753790733a(15) =973261651722

External references