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%I #11 Dec 04 2013 06:30:05
%S 0,1,5,14,31,55,91,146,204,285,400,506,655,850,1015,1240,1552,1804,
%T 2109,2562,2870,3311,3971,4324,4914,5730,6201,6990,8000,8555,9455,
%U 10846,11536,12529,14192,14910,16206,18371,19088,20540,22990,23821,25794
%N (1/24)*(sigma_3(2n-1)-sigma_1(2n-1)).
%H Harvey P. Dale, <a href="/A081861/b081861.txt">Table of n, a(n) for n = 1..1000</a>
%t Table[(DivisorSigma[3,2n-1]-DivisorSigma[1,2n-1])/24,{n,50}] (* _Harvey P. Dale_, Dec 15 2012 *)
%Y Cf. A000203, A001158, A081863(1).
%K nonn
%O 1,3
%A _Benoit Cloitre_, Apr 11 2003
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