%I A004461
%S A004461 20,21,22,23,16,17,18,19,28,29,30,31,24,25,26,27,4,5,6,
%T A004461 7,0,1,2,3,12,13,14,15,8,9,10,11,52,53,54,55,48,49,50,51,
%U A004461 60,61,62,63,56,57,58,59,36,37,38,39,32,33,34,35,44,45
%N A004461 Nimsum n + 20.
%D A004461 E. R. Berlekamp, J. H. Conway and R. K. Guy, Winning Ways, Academic Press, 
               NY, 2 vols., 1982, see p. 60.
%D A004461 J. H. Conway, On Numbers and Games. Academic Press, NY, 1976, pp. 51-53.
%H A004461 <a href="Sindx_Ni.html#Nimsums">Index entries for sequences related to 
               Nim-sums</a>
%F A004461 a(n) = n + 4(-1)^[n/4] + 16(-1)^[n/16] - Mitchell Harris, Jan 10 2005
%Y A004461 Sequence in context: A165841 A091235 A078286 this_sequence A008553 A007930 
               A133895
%Y A004461 Adjacent sequences: A004458 A004459 A004460 this_sequence A004462 A004463 
               A004464
%K A004461 nonn
%O A004461 0,1
%A A004461 N. J. A. Sloane (njas(AT)research.att.com).