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 A102122 #10 Sep 10 2024 17:18:57
%S A102122 0,0,1,1,2,4,7,31,42,26,531,302,67,909,8721,4522,48811,72152,6487,
%T A102122 908821,844702,6572211,9726782,29139201,58129562,86185456,139627251,
%U A102122 949140792,656458225,9962261161,6171227123,20114953831,68392496992
%N A102122 Iccanobirt numbers (12 of 15): a(n) = R(R(a(n-1)) + a(n-2) + a(n-3)), where R is the digit reversal function A004086.
%C A102122 Digit reversal variation of tribonacci numbers A000073.
%C A102122 Inspired by Iccanobif numbers: A001129, A014258-A014260.
%F A102122 a(n) = A004086(A102114(n)).
%t A102122 R[n_]:=FromDigits[Reverse[IntegerDigits[n]]];Clear[a];a[0]=0;a[1]=0;a[2]=1;a [n_]:=a[n]=R[R[a[n-1]]+a[n-2]+a[n-3]];Table[a[n], {n, 0, 40}]
%t A102122 nxt[{a_,b_,c_}]:={b,c,IntegerReverse[IntegerReverse[c]+b+a]}; NestList[nxt,{0,0,1},40][[;;,1]] (* _Harvey P. Dale_, Sep 10 2024 *)
%Y A102122 Cf. A102111-A102125.
%K A102122 nonn,base,easy
%O A102122 0,5
%A A102122 _Jonathan Vos Post_ and _Ray Chandler_, Dec 30 2004