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%I #3 Mar 02 2015 16:08:47
%S 1,1,3,3,1,6,2,9,2,11,21,11,23,8,22,1,17,34,7,26,46,12,34,57,15,40,66,
%T 15,43,72,11,42,74,2,36,71,107,24,62,101,5,46,88,131,22,67,113,160,37,
%U 86,136,187,49,102,156,1,57,114,172,231,60,121,183,246,57,122,188,255
%N Fill a triangular array by rows by writing numbers 1 up to b(0), 1 up to b(1), etc., where b(n) are the triangular numbers. The first elements of the rows form a(n).
%Y Cf. A064766, A064865, A065221-A065226, A065228-A065234.
%K easy,nonn
%O 0,3
%A _Floor van Lamoen_, Oct 22 2001
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