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 A087834 #7 Jul 22 2025 05:54:30
%S A087834 1,1,2,2,2,3,3,3,3,4,4,4,4,4,5,5,5,5,5,5,6,7,7,7,7,7,7,7,8,9,9,9,9,9,
%T A087834 9,9,9,9,10,11,11,11,11,11,11,11,11,11,11,11,12,13,13,13,13,13,13,13,
%U A087834 13,13,13,13,13,13,14,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,16,17
%N A087834 a[n] =a[a[a[n-1]]] + a[n -1- a[n-2]].
%C A087834 Triple recursion version of A055748.
%t A087834 hg[n_Integer?Positive] := hg[n] =hg[hg[hg[n-1]]] + hg[n -1- hg[n-2]] hg[1] = hg[2] = 1 digits=200 a=Table[hg[n], {n, 1, digits}]
%Y A087834 Cf. A055748.
%K A087834 nonn
%O A087834 1,3
%A A087834 _Roger L. Bagula_, Oct 07 2003