Number of 5 X 5 X 5 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.
A166213
Number of 5 X 5 X 5 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =30a(4) =64a(5) =122a(6) =218a(7) =364a(8) =579a(9) =886a(10) =1310a(11) =1880a(12) =2636a(13) =3614a(14) =4862a(15) =6434a(16) =8387a(17) =10784a(18) =13704a(19) =17220a(20) =21422a(21) =26408a(22) =32280a(23) =39148a(24) =47143a(25) =56388a(26) =67028a(27) =79218a(28) =93118a(29) =108898
External references
- oeis: A166213