Search: id:A000570
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%I A000570
%S A000570 1,1,2,4,7,11,18,31,53,89,149,251,424,715,1204,2028,3418,5761,9708,
%T A000570 16358,27565,46452,78279,131910,222285,374581,631222,1063696,1792472,
%U A000570 3020560,5090059,8577449,14454177,24357268,41045336,69167021,116555915
%N A000570 Number of tournaments on n nodes determined by their score vectors.
%D A000570 Prasad Tetali, A characterization of unique tournaments, J. Comb Theory 
               B 72 (1) (1998), 157-159.
%H A000570 T. D. Noe, <a href="b000570.txt">Table of n, a(n) for n=1..500</a>
%H A000570 <a href="Sindx_To.html#tournament">Index entries for sequences related 
               to tournaments</a>
%F A000570 a(n) = a(n-5) + a(n-4) + a(n-3) + a(n-1). - Jon Schoenfield (jonscho(AT)hiwaay.net), 
               Aug 07 2006
%p A000570 A000570 := proc(n) option remember; if n <= 2 then RETURN(1) elif n=3 
               then RETURN(2) elif n=4 then RETURN(4) elif n=5 then RETURN(7) else 
               A000570(n-1)+A000570(n-3)+A000570(n-4)+A000570(n-5); fi; end;
%Y A000570 Sequence in context: A091838 A004696 A018063 this_sequence A023426 A157134 
               A127926
%Y A000570 Adjacent sequences: A000567 A000568 A000569 this_sequence A000571 A000572 
               A000573
%K A000570 nonn,nice
%O A000570 1,3
%A A000570 Prasad Tetali [ tetali(AT)math.gatech.edu ]
%E A000570 More terms from James A. Sellers (sellersj(AT)math.psu.edu), Feb 06 2000

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