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 A048112 #11 Jul 14 2024 16:00:30
%S A048112 1,1,1,2,3,5,16,63,395,7328,486549,195081415,1433122040192,
%T A048112 697379012200764243,136045964066902820948075525,
%U A048112 194970470582876525091946983913863955456
%N A048112 a(1) = 1, a(2) = 1, a(3) = 1, a(n) = a(n-3) * (a(n-2) + a(n-1)).
%t A048112 RecurrenceTable[{a[1]==a[2]==a[3]==1,a[n]==a[n-3] (a[n-2]+a[n-1])},a,{n,20}] (* _Harvey P. Dale_, Jan 14 2012 *)
%t A048112 nxt[{a_,b_,c_}]:={b,c,a(b+c)}; NestList[nxt,{1,1,1},20][[;;,1]] (* _Harvey P. Dale_, Jul 14 2024 *)
%Y A048112 Cf. A048122.
%K A048112 nonn,easy
%O A048112 1,4
%A A048112 _David Johnson-Davies_
%E A048112 More terms from _Patrick De Geest_, Jun 15 1999