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 A280518 #13 Apr 29 2018 02:13:10 %S A280518 1,0,1,7,78,2392,248085,151428144 %N A280518 Number of increasing sequences of n positive integers with reciprocals adding up to an integer. %e A280518 a(4)=7 enumerates sequences: (1,2,3,6), (2,4,5,20), (2,4,6,12), (2,3,7,42), (2,3,8,24), (2,3,9,18), and (2,3,10,15). %Y A280518 Row sums of A280520. %Y A280518 Cf. A006585 (adding up to 1), A156871 (nondecreasing sequences), A280517 (ordered sequences). %K A280518 nonn,hard,more %O A280518 1,4 %A A280518 _Max Alekseyev_, Jan 04 2017