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 A074861 #12 Jun 18 2021 14:29:46
%S A074861 1,1,1,3,5,9,17,85,138,960,958,1759,10499,109831,247873,617044,958359,
%T A074861 1773317,8528346,14525888,102424570,170715000,164793813,394338733,
%U A074861 656748025,1177078610,1027388860,1378392568,9510483643,12805616091
%N A074861 Iccanobirt sequence: a(n) = R(a(n-1)) + R(a(n-2)) + R(a(n-3)) where a(1)=a(2)=a(3)=1 and R(n) (A004086) is the reverse of n.
%H A074861 Harvey P. Dale, <a href="/A074861/b074861.txt">Table of n, a(n) for n = 1..1000</a>
%t A074861 nxt[{a_,b_,c_}]:={b,c,FromDigits[Reverse[IntegerDigits[a]]] + FromDigits[ Reverse[IntegerDigits[b]]] + FromDigits[ Reverse[ IntegerDigits[c]]]}; Transpose[NestList[nxt,{1,1,1},30]][[1]] (* _Harvey P. Dale_, Nov 13 2012 *)
%Y A074861 Cf. A000213.
%K A074861 easy,base,nonn
%O A074861 1,4
%A A074861 _Felice Russo_, Sep 11 2002
%E A074861 More terms from _David Garber_, Oct 23 2002
%E A074861 Definition adapted to offset by _Georg Fischer_, Jun 18 2021