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 A247337 #14 Sep 08 2022 08:46:09
%S A247337 20,11,31,42,73,115,188,2913,4721,7634,12355,19989,322144,521233,
%T A247337 843377,1364610,2207987,35711597,57782584,93494181,151276765,
%U A247337 2447610946,3960317711,6407928657,10368246368,16776175025,271443121393,439204196418,710647317811,1149851514229
%N A247337 a(n) = Lucas(n) concatenated with Fibonacci(n).
%H A247337 Vincenzo Librandi, <a href="/A247337/b247337.txt">Table of n, a(n) for n = 0..1000</a>
%t A247337 Table[FromDigits[Join[Flatten[IntegerDigits[{LucasL[n], Fibonacci[n]}]]]], {n, 0, 50}]
%o A247337 (Magma) [20] cat [Seqint(Intseq(Fibonacci(n)) cat Intseq(Lucas(n))): n in [1..50]];
%Y A247337 Cf. A000032, A000045, A235497, A246972, A246973.
%K A247337 nonn,easy,base
%O A247337 0,1
%A A247337 _Vincenzo Librandi_, Sep 14 2014