A111630 T(3n, 3n-2)/n of A109626.

1, 1, 1, 2, 1, 2, 2, 3, 1, 1, 3, 2, 2, 1, 1, 1, 3, 2, 2, 3, 3, 1, 2, 3, 3, 2, 1, 3, 3, 1, 2, 1, 2, 2, 3, 2, 1, 2, 2, 2, 1, 1, 1, 1, 2, 3, 3, 1

Offset: 1

Author

Paul D. Hanna and Robert G. Wilson v, Aug 02 2005

Keywords

• nonn

Comments

A sequence of just 1's, 2's and 3's.

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, 128}]]; g[n_, m_] := f[n][[m]]; Table[ g[3n, 3n - 2]/n, {n, 48}]