Search: id:A060188
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%I A060188
%S A060188 1,6,23,76,237,722,2179,6552,19673,59038,177135,531428,1594309,4782954,
%T A060188 14348891,43046704,129140145,387420470,1162261447,3486784380,
%U A060188 10460353181,31381059586,94143178803,282429536456,847288609417
%N A060188 A diagonal of A060187.
%C A060188 Sums of rows of the numerators and of the denominators of the redundant 
               Stern-Brocot structure A152975/A152976: a(n+2) = Sum(A152975(k):2^n<=k<2^(n+1)) 
               = Sum(A152976(k):2^n<=k<2^(n+1)). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), 
               Dec 22 2008]
%D A060188 P. A. MacMahon, The divisors of numbers, Proc. London Math. Soc., (2) 
               19 (1920), 305-340; Coll. Papers II, pp. 267-302.
%F A060188 a(n) =3^(n-1)-n =A061980(n-1, 2). - Henry Bottomley (se16(AT)btinternet.com), 
               May 24 2001
%F A060188 With offset 0, this is 3^(n+1)-n-2. Partial sums of A048473. - Paul Barry 
               (pbarry(AT)wit.ie), Jun 24 2003
%p A060188 a[0]:=1:for n from 1 to 24 do a[n]:=(4*a[n-1]-3*a[n-2]+2) od: seq(a[n], 
               n=0..24); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 08 
               2007
%t A060188 s=1;lst={s};Do[s+=(n+=s++)+n;AppendTo[lst, s], {n, 1, 5!, 1}];lst [From 
               Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 15 2008]
%Y A060188 Sequence in context: A038797 A136530 A054459 this_sequence A058751 A034359 
               A114245
%Y A060188 Adjacent sequences: A060185 A060186 A060187 this_sequence A060189 A060190 
               A060191
%K A060188 nonn,easy
%O A060188 2,2
%A A060188 N. J. A. Sloane (njas(AT)research.att.com), Mar 20 2001
%E A060188 More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 20 2001

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