Number of 4 X 4 X 4 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.
A166212
Number of 4 X 4 X 4 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.
Terms
- a(0) =1a(1) =3a(2) =6a(3) =14a(4) =25a(5) =39a(6) =66a(7) =99a(8) =138a(9) =201a(10) =274a(11) =357a(12) =479a(13) =616a(14) =768a(15) =977a(16) =1207a(17) =1458a(18) =1788a(19) =2146a(20) =2532a(21) =3022a(22) =3548a(23) =4110a(24) =4805a(25) =5545a(26) =6330a(27) =7280a(28) =8285a(29) =9345
External references
- oeis: A166212