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Triangle read by rows, A129186 * A128064(unsigned).
3

%I #3 Mar 30 2012 17:25:33

%S 1,1,0,1,2,0,0,2,3,0,0,0,3,4,0,0,0,0,4,5,0,0,0,0,0,5,6,0,0,0,0,0,0,6,

%T 7,0,0,0,0,0,0,0,7,8,0,0,0,0,0,0,0,0,8,9,0

%N Triangle read by rows, A129186 * A128064(unsigned).

%C Lim_{k->inf} A153869^n = A000255: (1, 1, 3, 11, 53, 309, 2119,...).

%C Row sums = (1, 1, 3, 5, 7, 9,...).

%C A153869 * (1, 2, 3,...) = A001844 prefaced with a 1: (1, 1, 5, 13, 25, 41,...).

%F Triangle read by rows, A129186 * A128064; where A129186 = a shift operator, shifting down triangle A128064(unsigned) one row and inserting a "1" at (1,1).

%e First few rows of the triangle =

%e 1;

%e 1, 0;

%e 1, 2, 0;

%e 0, 2, 3, 0;

%e 0, 0, 3, 4, 0;

%e 0, 0, 0, 4, 5, 0;

%e 0, 0, 0, 0, 5, 6, 0;

%e 0, 0, 0, 0, 0, 6, 7, 0;

%e 0, 0, 0, 0, 0, 0, 7, 8, 0;

%e ...

%Y Cf. A128064, A129186, A000255, A001844

%K nonn,tabl

%O 1,5

%A _Gary W. Adamson_, Jan 03 2009