Triangle T(n,k) read by rows: Number of non-equivalent ways (mod D_3) to choose k points from an nXnXn triangular grid so that no three of them form a 2X2X2 subtriangle.
A234247
Triangle T(n,k) read by rows: Number of non-equivalent ways (mod D_3) to choose k points from an nXnXn triangular grid so that no three of them form a 2X2X2 subtriangle.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =4a(6) =2a(7) =3a(8) =10a(9) =22a(10) =31a(11) =22a(12) =10a(13) =1a(14) =4a(15) =22a(16) =82a(17) =212a(18) =374a(19) =450a(20) =342a(21) =156a(22) =36a(23) =2a(24) =5a(25) =41a(26) =231a(27) =955a(28) =2880a(29) =6459
External references
- oeis: A234247