OFFSET
1,2
COMMENTS
a(1) = 1, a(2) = 2, a(3) = 3, a(n) = 0 for n >= 4.
FORMULA
A000203(a(n)) = a(n-1) + 2 for n >= 2.
PROG
(PARI) a(n)=if(n>3, 0, n) \\ Charles R Greathouse IV, Feb 14 2013
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Jaroslav Krizek, Nov 06 2010
STATUS
approved