%I #8 Sep 27 2019 02:50:55
%S 1,4,9,18,27,40,55,72,89,113,140,167,194,221,253,294,329,369,419,452,
%T 502,552,618,677,721,776,836,894,976,1049,1121,1175,1248,1348,1415,
%U 1489,1574,1658,1756,1845,1925,2037,2122,2224,2356,2442,2551,2635,2762,2875,3000
%N a(n) = position of the n-th n in A026409.
%K nonn
%O 1,2
%A _Clark Kimberling_
%E More terms from _Sean A. Irvine_, Sep 26 2019