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a(n) = floor(floor(S3)/floor(S1)); where S3 and S1 are, respectively, the third and first elementary symmetric functions of {log(k)}, k = 1,2,...,n.
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%I #11 Aug 18 2019 21:58:17

%S 0,1,3,6,11,18,25,36,50,64,81,104,127,153,182,215,251,292,336,385,438,

%T 487,549,616,687,753,835,910,1002,1087,1190,1285,1400,1505,1632,1748,

%U 1870,1997,2148,2287,2431,2582,2759,2922,3091

%N a(n) = floor(floor(S3)/floor(S1)); where S3 and S1 are, respectively, the third and first elementary symmetric functions of {log(k)}, k = 1,2,...,n.

%F a(n) = floor(A025203(n) / A025201(n)). - _Sean A. Irvine_, Aug 18 2019

%K nonn

%O 4,3

%A _Clark Kimberling_

%E Title corrected and more terms from _Sean A. Irvine_, Aug 18 2019