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%I #5 Dec 05 2013 19:55:48
%S 1,2,3,5,7,10,15,21,30,43,61,87,123,174,247,349,494,699,989,1399,1979,
%T 2799,3959,5599,7919,11199,15838,22399,31677,44799,63355,89598,126711,
%U 179197,253423,358395,506847,716790,1013695,1433581,2027390,2867163
%N a(n) = index of the triangular number A076971(n).
%Y Cf. A076971.
%K nonn
%O 1,2
%A _Amarnath Murthy_, Oct 21 2002
%E Corrected and extended by _Sascha Kurz_, Jan 22 2003
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