A128020 a(n) = the multiple of n which is > (sum{k=1 to n-1} a(k)) and is <= (n + sum{k=1 to n-1} a(k)).

1, 2, 6, 12, 25, 48, 98, 200, 396, 790, 1584, 3168, 6331, 12670, 25335, 50672, 101354, 202698, 405403, 810800, 1621599, 3243196, 6486391, 12972792, 25945575, 51891164, 103782330, 207564644, 415129287, 830258580, 1660517170, 3321034336

Offset

1,2

Links

Table of n, a(n) for n=1..32.

Formula

a(n) = n * (1+ floor(sum{k=1 to n-1} a(k) /n)).

Mathematica

f[l_List] := Block[{n = Length[l] + 1}, Append[l, n*(1 + Floor[Plus @@ l/n])]]; Nest[f, {}, 33] (* Ray Chandler, Feb 12 2007 *)

Crossrefs

Cf. A128021, A128022.

Sequence in context: A261667 A116562 A045925 * A140659 A238462 A099495

Adjacent sequences: A128017 A128018 A128019 * A128021 A128022 A128023

Keyword

easy,nonn

Author

Leroy Quet, Feb 11 2007

Extensions

Extended by Ray Chandler, Feb 12 2007

Status

approved