OFFSET
1,1
FORMULA
a(n) = ceiling((n+1/2)^3). - Benoit Cloitre, Apr 16 2003
(1/8) {8n^3 + 36n^2 + 54n + 31 - (-1)^n - 2(-1)^[(n-1)/2] }. - Ralf Stephan, Jun 10 2005
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Sep 15 1998
STATUS
approved