OFFSET
1,3
FORMULA
a(n) = floor((2^(n*(n+1)/2 - 1))/(2^n-1)).
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Apr 03 2003
EXTENSIONS
Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 08 2003
STATUS
approved