A022824 a(n) = [ (2n+2)/(n-1) ] + [ (2n+4)/(n-2) ] + ... + [ (4n-2)/1 ].

6, 14, 23, 33, 44, 55, 67, 81, 93, 105, 120, 133, 149, 164, 177, 191, 210, 222, 240, 256, 270, 288, 305, 322, 336, 355, 373, 387, 410, 421, 441, 460, 478, 496, 516, 530, 548, 571, 587, 603, 626, 643, 663, 684, 700, 716, 741, 758, 780, 797, 815

Offset: 2

Author

Clark Kimberling

Keywords

• nonn

Programs

PARI

a(n) = sum(k=1, n-1, (4*n-2*k)\k); \\ for n>1. Michel Marcus, Mar 24 2013