OFFSET
0,2
COMMENTS
The number of distinct sums of reciprocals is given by A212607.
a(n) grows as 2^(b*n) with b=0.911... (Tikhomirov et al. 2017).
LINKS
Robert Gerbicz, Table of n, a(n) for n = 0..95
M. Tikhomirov et al., Sets of unit fractions with sum <=1, MathOverflow, 2017.
PROG
(PARI) { A212657(n) = my(L=lcm(vector(n, i, i))); polcoeff( prod(i=1, n, 1+x^(L/i)+O(x^(L+1)) )/(1-x), L); }
CROSSREFS
KEYWORD
nonn
AUTHOR
Max Alekseyev, May 23 2012
EXTENSIONS
a(32)-a(35) from Alois P. Heinz, May 23 2012
a(36)-a(95) from Robert Gerbicz, May 23 2012
STATUS
approved