A111615 Third upper diagonal of the array in A109626.

1, 2, 3, 4, 5, 3, 7, 8, 9, 5, 11, 12, 13, 14, 15, 16, 17, 9, 19, 10, 21, 11, 23, 24, 25, 26, 27, 28, 29, 15, 31, 32, 33, 17, 35, 18, 37, 19, 39, 40, 41, 42, 43, 22, 45, 46, 47, 48, 49, 25, 51, 26, 53, 54, 55, 28, 57, 29, 59, 60, 61, 31, 63, 64, 65, 66, 67, 68, 69, 70, 71, 36, 73

Offset: 1

Author

Paul D. Hanna and Robert G. Wilson v, Jul 30 2005

Keywords

• nonn

Crossrefs

Cf. A109626.

Programs

Mathematica

f[n_] := f[n] = Block[{a}, a[0] = 1; a[l_] := a[l] = Block[{k = 1, s = Sum[ a[i]*x^i, {i, 0, l - 1}]}, While[ IntegerQ[ Last[ CoefficientList[ Series[(s + k*x^l)^(1/n), {x, 0, l}], x]]] != True, k++ ]; k]; Table[a[j], {j, 0, 80}]]; g[n_, m_] := f[n][[m]]; Table[ g[n, n + 3], {n, 74}]