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 A048634 #43 Sep 29 2021 15:41:23
%S A048634 0,0,1,0,1,1,1,2,3,5,13,44,233,3073,135445,31561758,96989417779,
%T A048634 13136731722638413,414618347540933702027833,
%U A048634 40213592128486236142855326045681320,528275171395527518169753769210241662354568290572993
%N A048634 a(n) = a(n-1)*a(n-3) + a(n-2), with a(0)=a(1)=0 and a(2)=1.
%F A048634 a(n) ~ c^(A092526^n), where c = A344388 = 1.0574735961... (very close to A201506). - _Vaclav Kotesovec_, Aug 16 2021
%p A048634 A048634 := proc(n) option remember; if n<=1 then 0 elif n=2 then 1 else A048634(n-1)*A048634(n-3)+A048634(n-2); fi; end;
%t A048634 RecurrenceTable[{a[n] == a[n-1]*a[n-3] + a[n-2], a[0] == 0, a[1] == 0, a[2] == 1}, a, {n, 0, 20}] (* _Vaclav Kotesovec_, Aug 16 2021 *)
%K A048634 nonn,easy
%O A048634 0,8
%A A048634 _N. J. A. Sloane_, David(AT)interface.co.uk
%E A048634 Name clarified by _Michel Marcus_, Aug 16 2021