OFFSET
0,2
COMMENTS
FORMULA
a(n) = numerator(4*n/(n+2)), n >= 0.
a(n) = 4*n/gcd(n+2,4*n) = 4*n/gcd(n+2,8), n >= 0.
EXAMPLE
The rationals H(n,2) begin:
0, 4/3, 2, 12/5, 8/3, 20/7, 3, 28/9, 16/5, 36/11, 10/3, 44/13, 24/7, 52/15, 7/2, 60/17, ...
CROSSREFS
KEYWORD
nonn,easy,frac
AUTHOR
Wolfdieter Lang, Jul 01 2013
STATUS
approved