Search: id:A100543
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%I A100543
%S A100543 1,3,3,0,10,12,1,24,25,32,116,12,412,109,126,2389,12497,28772,126,72795,
%T A100543 247786,770213,159378001963452599312,2169128,26,311,378,789,10015050,75,
%U A100543 74253544,7881195,2461717833658872781238383813854943728
%V A100543 1,3,3,0,10,12,1,24,25,32,116,12,412,109,126,2389,12497,28772,126,72795,
               247786,770213,
%W A100543 159378001963452599312,2169128,-26,311,378,789,10015050,75,74253544,7881195,
%X A100543 2461717833658872781238383813854943728
%N A100543 Sum of first n terms of A_n (signed values).
%C A100543 Since the sequences in the OEIS occasionally change their initial terms 
               (for editorial reasons), this is an especially ill-defined sequence! 
               - N. J. A. Sloane (njas(AT)research.att.com), Jan 01 2005
%e A100543 A000001 (Number of groups of order n) begins 1,... -> a(1)= 1
%e A100543 A000002 (Kolakoski sequence) begins 1,2,... -> a(2)= 3
%e A100543 A000003 begins 1,1,1,... -> a(3)= 3
%e A100543 A000004 (The zero sequence) begins 0,0,0,0,... -> a(4)= 0
%e A100543 A000005 (The number of divisors) begins 1,2,2,3,2,... -> a(5)=10
%e A100543 ...........
%e A100543 A000009 begins 1,1,2,2,4,2,6,4,6,... so a(9) = 1+1+2+2+4+2+6+4+6 = 28.
%Y A100543 Cf. A031135, A031214, A039928, A100544.
%Y A100543 Sequence in context: A164107 A093755 A120981 this_sequence A039928 A137259 
               A111843
%Y A100543 Adjacent sequences: A100540 A100541 A100542 this_sequence A100544 A100545 
               A100546
%K A100543 dumb,easy,sign
%O A100543 1,2
%A A100543 Russ Cox (rsc(AT)swtch.com)
%E A100543 Corrected and extended by C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 
               27 2004

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