%I A101563
%S A101563 1,9,101,1009,10001,99909,1000001,10001009,100000101,999990009,
%T A101563 10000000001,100000100909,1000000000001,9999999000009,100000000010101,
%U A101563 1000000010001009,10000000000000001,99999999900099909
%N A101563 a(n)=(-1)^n*coefficient of x^n in sum{k>=1,x^(k-1)/(1+10x^k)}.
%F A101563 a(n)=sum{k=0..n, (-1)^(n-k)*if(mod(n+1, k+1)=0, 1, 0)*10^k}
%Y A101563 Cf. A051731, A081295, A048272, A101561, A101562.
%Y A101563 Sequence in context: A056002 A060150 A103461 this_sequence A007133 A083452 
               A081461
%Y A101563 Adjacent sequences: A101560 A101561 A101562 this_sequence A101564 A101565 
               A101566
%K A101563 easy,nonn
%O A101563 0,2
%A A101563 Paul Barry (pbarry(AT)wit.ie), Dec 07 2004