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Inverse of number triangle A128210.
2

%I #6 Mar 31 2024 15:36:54

%S 1,1,1,0,1,1,0,0,3,1,0,0,0,5,1,0,0,0,0,11,1,0,0,0,0,0,21,1,0,0,0,0,0,

%T 0,43,1,0,0,0,0,0,0,0,85,1,0,0,0,0,0,0,0,0,171,1,0,0,0,0,0,0,0,0,0,

%U 341,1

%N Inverse of number triangle A128210.

%C Subdiagonal is A001045(n+1). Row sums are A128209.

%e Triangle begins:

%e 1;

%e 1, 1;

%e 0, 1, 1;

%e 0, 0, 3, 1;

%e 0, 0, 0, 5, 1;

%e 0, 0, 0, 0, 11, 1;

%e 0, 0, 0, 0, 0, 21, 1;

%e 0, 0, 0, 0, 0, 0, 43, 1;

%e 0, 0, 0, 0, 0, 0, 0, 85, 1;

%e 0, 0, 0, 0, 0, 0, 0, 0, 171, 1;

%e 0, 0, 0, 0, 0, 0, 0, 0, 0, 341, 1;

%e ...

%K nonn,tabl

%O 0,9

%A _Paul Barry_, Feb 19 2007