%I #17 Jun 15 2019 10:41:08
%S 1,2,5,16,58,440,17281,16049141,8010046523646
%N Index of first occurrence of n in A280055.
%F a(n) = a(n-1) + {sum of members of A008578 <= a(n-1)}. - _Charlie Neder_, Jun 14 2019
%Y Cf. A280055, A008578.
%K nonn,more
%O 1,2
%A _N. J. A. Sloane_, Jan 08 2017
%E a(7)-a(9) from _Lars Blomberg_, Jan 11 2017