This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A280760 #17 Jun 15 2019 10:41:08
%S A280760 1,2,5,16,58,440,17281,16049141,8010046523646
%N A280760 Index of first occurrence of n in A280055.
%F A280760 a(n) = a(n-1) + {sum of members of A008578 <= a(n-1)}. - _Charlie Neder_, Jun 14 2019
%Y A280760 Cf. A280055, A008578.
%K A280760 nonn,more
%O A280760 1,2
%A A280760 _N. J. A. Sloane_, Jan 08 2017
%E A280760 a(7)-a(9) from _Lars Blomberg_, Jan 11 2017