A128023 a(n) = A128022(n)/n.

1, 1, 1, 2, 3, 5, 9, 16, 28, 51, 92, 169, 312, 580, 1082, 2029, 3819, 7214, 13669, 25971, 49468, 94439, 180666, 346277, 664852, 1278561, 2462414, 4748941, 9170369, 17729380, 34314929, 66485175, 128940946, 250297130, 486291567, 945566936

Offset

1,4

Links

Table of n, a(n) for n=1..36.

Formula

a(1)=1, a(n) = ceiling(Sum_{k=1..n-1} A128022(k)/n).

Mathematica

f[l_List] := Block[{n = Length[l] + 1}, Append[l, Ceiling[Sum[k*l[[k]], {k, n - 1}]/n]]]; Nest[f, {1}, 36] (* Ray Chandler, Feb 12 2007 *)

Crossrefs

Cf. A128022.

Sequence in context: A002572 A114834 A143961 * A000048 A056303 A074099

Adjacent sequences: A128020 A128021 A128022 * A128024 A128025 A128026

Keyword

easy,nonn

Author

Leroy Quet, Feb 11 2007

Extensions

Extended by Ray Chandler, Feb 12 2007

Status

approved