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a(n) = k such that A083087(k-1) = n.
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%I #2 Mar 30 2012 17:27:47

%S 1,3,2,6,5,10,15,4,21,9,28,36,8,45,14,55,20,66,78,7,91,27,105,120,13,

%T 136,35,153,44,171,190,12,210,54,231,253,19,276,65,300,325,26,351,77,

%U 378,90,406,435,11,465,104,496,528,34,561,119,595,135,630,666,18,703

%N a(n) = k such that A083087(k-1) = n.

%C Sequence is a permutation of the positive integers; inverse permutation to sequence A083087 taken with offset 1.

%e A083087(9) = 6, hence a(6) = 10.

%Y Cf. A083087.

%K nonn

%O 1,2

%A _Klaus Brockhaus_, Jan 19 2006