Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 8 ones in any 5 X 5 X 5 subtriangle.

A153964

Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 8 ones in any 5 X 5 X 5 subtriangle.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =4a(4) =6a(5) =8a(6) =17a(7) =62a(8) =97a(9) =362a(10) =1324a(11) =3868a(12) =13138a(13) =92566a(14) =270599a(15) =1645369a(16) =11553340a(17) =61799175a(18) =385381600a(19) =4833634814a(20) =26435310212a(21) =299198500876

External references