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A025203 a(n) = [ 3rd elementary symmetric function of {log(k)} ], k = 2,3,...,n. 2

%I #13 Aug 17 2019 02:29:41

%S 1,6,21,54,116,220,383,623,962,1424,2034,2821,3817,5053,6565,8391,

%T 10569,13142,16153,19646,23671,28274,33509,39426,46082,53533,61836,

%U 71051,81240,92466,104793,118288,133018,149054,166464,185324,205704,227683,251334

%N a(n) = [ 3rd elementary symmetric function of {log(k)} ], k = 2,3,...,n.

%p SymmPolyn := proc(L::list,n::integer)

%p local c,a,sel;

%p a :=0 ;

%p sel := combinat[choose](nops(L),n) ;

%p for c in sel do

%p a := a+mul(L[e],e=c) ;

%p end do:

%p a;

%p end proc:

%p A025203 := proc(n)

%p [seq(log(k),k=2..n)] ;

%p SymmPolyn(%,3);

%p floor(%) ;

%p end proc: # _R. J. Mathar_, Sep 23 2016

%K nonn

%O 4,2

%A _Clark Kimberling_

%E a(15) corrected by Neven Juric (neven.juric(AT)apis-it.hr), May 28 2004

%E Offset set to 4 by _R. J. Mathar_, Sep 23 2016

%E More terms from _Sean A. Irvine_, Aug 17 2019

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)