Search: id:A074079
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%I A074079
%S A074079 1,1,0,0,0,0,1,1,0,0,0,0,0,0,0,0,1,1,0,0,0,0,1,1,0,0,0,0,1,0,2,1,0,0,0,
%T A074079 0,0,0,3,2,0,0,0,0,0,0,1,3,5,1,0,0,0,0,0,0,1,3,10,3,0,0,0,0,0,0,0,0,3,
%U A074079 17,9,1,0,0,0,0,0,0,0,1,5,28,24,4,0,0,0,0,0,0,0,0,0,4,41,57,14,1,0,0,0
%N A074079 Square array A(row,col) (listed in order A(0,0), A(0,1), A(1,0), A(0,
               2), A(1,1), A(2,0), A(0,3), etc), giving essentially the same information 
               as the triangle A074080 which shows only the upper triangular region.
%F A074079 A074079(n, k) = A073346(n, k)/(2^k)
%p A074079 A074079bi := (n,k) -> A073346bi(n,k)/(2^k);
%p A074079 A074079 := n -> A074079bi(A025581(n), A002262(n));
%p A074079 A025581 := n -> binomial(1+floor((1/2)+sqrt(2*(1+n))),2) - (n+1);
%p A074079 A002262 := n -> n - binomial(floor((1/2)+sqrt(2*(1+n))),2);
%Y A074079 Obtained from the square array A073346 by dividing the entries on the 
               k-th row by 2^k. Column sums: A073431. See A074080 for explanation. 
               Cf. also A025581, A002262.
%Y A074079 Sequence in context: A127844 A017877 A095683 this_sequence A037858 A037876 
               A161519
%Y A074079 Adjacent sequences: A074076 A074077 A074078 this_sequence A074080 A074081 
               A074082
%K A074079 nonn,tabl
%O A074079 0,31
%A A074079 Antti Karttunen Aug 19 2002

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