OFFSET
1,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..500
Knopfmacher, Arnold; Munagi, Augustine O. Smallest parts in compositions, Kotsireas, Ilias S. (ed.) et al., Advances in combinatorics. In part based on the 3rd Waterloo workshop on computer algebra (WWCA, W80) 2011, Waterloo, Canada, May 26-29, 2011. Berlin: Springer. 197-207 (2013).
FORMULA
G.f.: (1-x)^2*Sum(x^k/(1-x-x^k)^2, k=1..infinity).
a(n) ~ n*2^(n-3). - Vaclav Kotesovec, Apr 30 2014
MATHEMATICA
Drop[ CoefficientList[ Series[(1 - x)^2*Sum[x^k/(1 - x - x^k)^2, {k, 50}], {x, 0, 30}], x], 1] (* Robert G. Wilson v, Sep 08 2004 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Vladeta Jovovic, Sep 05 2004
EXTENSIONS
More terms from Robert G. Wilson v, Sep 08 2004
STATUS
approved