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%I #9 Mar 25 2013 09:34:41
%S 4,9,16,22,30,38,47,54,65,73,85,91,104,114,125,134,145,157,170,178,
%T 192,200,217,225,238,251,264,272,289,299,314,324,338,352,365,375,390,
%U 402,421,428,445,455,472,484,497,511,529,539,554,566,585,591
%N a(n) = [ (n+2)/(n-1) ] + [ (n+4)/(n-2) ] + ... + [ (3n-2)/1 ].
%o (PARI) a(n) = sum(k=1, n-1, (3*n-2*k)\k); \\ _Michel Marcus_, Mar 24 2013
%K nonn
%O 2,1
%A _Clark Kimberling_