Search: id:A140750
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%I A140750
%S A140750 1,1,1,1,1,1,3,1,1,1,1,5,3,5,1,1,1,1,7,5,13,5,7,1,1,1,1,9,7,25,13,25,7,
%T A140750 9,1,1,1,1,11,9,41,25,63,25,41,9,11,1,1,1,1,13,11,61,41,129,63,129,41,
%U A140750 61,11,13,1,1
%N A140750 Triangle read by rows, X^n * [1,0,0,0,...]; where X = an infinite tridiagonal 
               matrix with (1,0,1,0,1,...) in the main and subsubdiagonals and (1,
               1,1,...) in the subdiagonal.
%C A140750 Row sums = A001333 starting (1, 3, 7, 17, 41, 99, 239,...).
%e A140750 First few rows of the triangle are:
%e A140750 1;
%e A140750 1, 1, 1;
%e A140750 1, 1, 3, 1, 1;
%e A140750 1, 1, 5, 3, 5, 1, 1;
%e A140750 1, 1, 7, 5, 13, 5, 7, 1, 1;
%e A140750 1, 1, 9, 7, 25, 13, 25, 7, 9, 1, 1;
%e A140750 1, 1, 11, 9, 41, 25, 63, 25, 41, 9, 11, 1, 1;
%e A140750 1, 1, 13, 11, 61, 41, 129, 63, 129, 41, 61, 11, 13, 1, 1;
%e A140750 ...
%Y A140750 Cf. A001333, A140751.
%Y A140750 Sequence in context: A131324 A079724 A111368 this_sequence A028264 A010122 
               A058663
%Y A140750 Adjacent sequences: A140747 A140748 A140749 this_sequence A140751 A140752 
               A140753
%K A140750 nonn,tabl
%O A140750 1,7
%A A140750 Gary W. Adamson & Roger L. Bagula (qntmpkt(AT)yahoo.com), May 26 2008

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