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A022822
a(n) = [ (n+2)/(n-1) ] + [ (n+4)/(n-2) ] + ... + [ (3n-2)/1 ].
0
4, 9, 16, 22, 30, 38, 47, 54, 65, 73, 85, 91, 104, 114, 125, 134, 145, 157, 170, 178, 192, 200, 217, 225, 238, 251, 264, 272, 289, 299, 314, 324, 338, 352, 365, 375, 390, 402, 421, 428, 445, 455, 472, 484, 497, 511, 529, 539, 554, 566, 585, 591
OFFSET
2,1
PROG
(PARI) a(n) = sum(k=1, n-1, (3*n-2*k)\k); \\ Michel Marcus, Mar 24 2013
CROSSREFS
Sequence in context: A313349 A313350 A152399 * A001639 A309138 A162207
KEYWORD
nonn
STATUS
approved