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 A033898 #10 Feb 03 2025 05:38:34 %S A033898 15,30,33,66,132,255,510,525,780,858,1446,2892,5181,6339,9708,10497, %T A033898 11976,23655,47211,58458,104046,105492,117951,229530,251889,377778, %U A033898 755556,1311123,2422356,4645812,5890380,5926269,8182968,9451857,10907646 %N A033898 Sort then Add, a(1)=15. %p A033898 A033898 := proc(n) %p A033898 option remember ; %p A033898 if n =1 then %p A033898 15; %p A033898 else %p A033898 A070196(procname(n-1)) ; %p A033898 end if; %p A033898 end proc: %p A033898 seq(A033898(n),n=1..100) ; # _R. J. Mathar_, Feb 03 2025 %Y A033898 Cf. A033860. %K A033898 nonn,base,easy %O A033898 1,1 %A A033898 _N. J. A. Sloane_, _David W. Wilson_