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

A153946

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

Terms

    a(0) =1a(1) =2a(2) =2a(3) =3a(4) =4a(5) =4a(6) =8a(7) =28a(8) =30a(9) =85a(10) =295a(11) =509a(12) =1187a(13) =7245a(14) =11515a(15) =45155a(16) =251258a(17) =668550a(18) =2564348a(19) =22927188a(20) =58681071a(21) =365101542a(22) =3245521086a(23) =13341587072a(24) =79655532465

External references