OFFSET
0,2
COMMENTS
FORMULA
a(n) = SUM[i=1..n] A001426(i).
EXAMPLE
a(8) = 1 + 1 + 3 + 12 + 58 + 325 + 2143 + 17291 + 221805 = 241639.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jonathan Vos Post, May 11 2006
STATUS
approved