A022821 [ (n+1)/(n-1) ] + [ (n+2)/(n-2) ] + ... + [ (2n-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

Links

Table of n, a(n) for n=2..54.

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: A166092 A184913 A307761 * A001618 A118027 A082644

Adjacent sequences: A022818 A022819 A022820 * A022822 A022823 A022824

Keyword

nonn

Author

Clark Kimberling

Status

approved