Search: id:A103505
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%I A103505
%S A103505 1,1,2,6,12,20,30,42,56,72,90,110,132,156,182,210,240,272,306,342,380,
%T A103505 420,462,506,552,600,650,702,756,812,870,930,992,1056,1122,1190,1260,
%U A103505 1332,1406,1482,1560,1640,1722,1806,1892,1980,2070,2162,2256,2352,2450
%N A103505 Denominator in expansion of (1-x)ln(1-x).
%C A103505 See A002378 for many more comments and references.
%C A103505 Denominators for the sequence with e.g.f. (1-x)ln(1-x). Numerators are 
               given by 1-0^n-2(C(1,n)-C(0,n)). Also denominators for the sequence 
               with e.g.f. (1+x)ln(1+x). This sequence has numerators (-1)^n-0^n+2(C(1,
               n)-C(0,n)).
%F A103505 G.f.: (1-2x+2x^2+2x^3-x^4)/(1-x)^3; a(n)=0^n+C(1, n)-C(0, n)+2C(n, 2).
%Y A103505 Cf. A000384. Apart from initial terms, same as A002378.
%Y A103505 Sequence in context: A098734 A160942 A160929 this_sequence A002378 A005991 
               A003274
%Y A103505 Adjacent sequences: A103502 A103503 A103504 this_sequence A103506 A103507 
               A103508
%K A103505 easy,nonn
%O A103505 0,3
%A A103505 Paul Barry (pbarry(AT)wit.ie), Feb 09 2005

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