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A022821
[ (n+1)/(n-1) ] + [ (n+2)/(n-2) ] + ... + [ (2n-1)/1 ].
1
3, 7, 11, 16, 22, 26, 33, 39, 45, 51, 59, 64, 72, 80, 86, 92, 103, 107, 117, 125, 131, 139, 149, 156, 164, 172, 182, 188, 200, 204, 215, 225, 231, 241, 253, 257, 267, 277, 287, 294, 306, 312, 322, 334, 342, 348, 362, 368, 381, 389, 397, 407, 419
OFFSET
2,1
PROG
(PARI) a(n) = sum(i=1, n-1, floor((2*n-i)/i)) \\ for n>1 Michel Marcus, Mar 22 2013
CROSSREFS
Sequence in context: A375053 A184913 A307761 * A001618 A118027 A082644
KEYWORD
nonn
STATUS
approved