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 A244746 #9 Sep 08 2022 08:46:08
%S A244746 1,1,4,25,116,164,194,16481,11690,1664364,136498136,2564496436,
%T A244746 4064014,491648100,436491616160,81368116641625,9259254936490,
%U A244746 148136161649810,164949369644900,149364943691810,362536161401640,41616363643649040,811166442536936160
%N A244746 Numbers obtained by concatenating the squares of the digits of Catalan(n).
%F A244746 a(n) = A048385(A000108(n)).
%e A244746 For n = 7, Catalan(7) = 429 and a(7) = 16481, which is the concatenation of the squares of the digits of 429. For n = 14, Catalan(14) = 2674440 and a(14) = 436491616160.
%t A244746 Table[FromDigits[Flatten[IntegerDigits/@(IntegerDigits[ CatalanNumber[ n]]^2)]],{n,0,30}] (* _Harvey P. Dale_, Sep 23 2020 *)
%o A244746 (Magma) [StringToInteger(&cat[IntegerToString(h): h in Reverse([i^2: i in Intseq(Catalan(n))])]): n in [0..30]];
%Y A244746 Cf. A000108, A048385.
%K A244746 nonn,base
%O A244746 0,3
%A A244746 _Vincenzo Librandi_, Jul 05 2014