%I #18 Feb 08 2022 22:08:24
%S 1,2,1,3,1,3,4,1,3,7,5,1,3,7,15,6,1,3,7,15,31,7,1,3,7,15,31,63,8,1,3,
%T 7,15,31,63,127,9,1,3,7,15,31,63,127,255,10,1,3,7,15,31,63,127,255,511
%N Triangle read by rows, "n" followed by (n-1) terms of (1, 3, 7, 15, ...).
%C Sum of terms in n-th row = rightmost term in next row.
%e First few rows of the triangle:
%e 1;
%e 2, 1;
%e 3, 1, 3;
%e 4, 1, 3, 7;
%e 5, 1, 3, 7, 15;
%e 6, 1, 3, 7, 15, 31;
%e 7, 1, 3, 7, 15, 31, 63;
%e ...
%Y Cf. A000225 (row sums).
%K nonn,tabl,easy
%O 1,2
%A _Gary W. Adamson_, Sep 01 2008
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