Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
%I
%S 1,6,14,25,39,56,76,98,124,153,185,220,258,299,343,389,439,492,548,
%T 607,669,734,802,872,946,1023,1103,1186,1272,1361,1453,1547,1645,1746,
%U 1850,1957,2067,2180,2296,2414,2536,2661,2789,2920,3054,3191,3331,3473,3619,3768,3920,4075,4233,4394
%N Floor((n^2+n)^(3/2)-n^3).
%t f[n_]=Floor[(n^2+n)^(3/2)]-n^3;
%t Table[f[n],{n,1,80}]
%K nonn
%O 1,2
%A _Clark Kimberling_, Jan 31 2011