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 A244559 #17 Sep 07 2025 11:55:14
%S A244559 1,4,36,416,140,4940,250160,160940,936464640,9364646400,981811366400,
%T A244559 1649810013600,3644490406400,6449149644811400,1904936491693664000,
%U A244559 408144496481646464000,925253664491646408136000,36160494994902549464000,141361625100160646494000
%N A244559 Numbers obtained by concatenating the squares of the digits of n!.
%F A244559 a(n) = A048385(A000142(n)). - _Michel Marcus_, Jul 04 2014
%e A244559 For n = 7, 7! = 5040 and a(7) = 250160, which is the concatenation of the squares of the digits of 5040. For n=8, 8! = 40320 and a(8) = 160940.
%t A244559 Table[FromDigits[Flatten[IntegerDigits/@(IntegerDigits[n!]^2)]],{n,20}] (* _Harvey P. Dale_, Sep 07 2025 *)
%o A244559 (Magma) [StringToInteger(&cat[IntegerToString(h): h in Reverse([i^2: i in Intseq(Factorial(n))])]): n in [1..50]];
%Y A244559 Cf. A000142, A048385.
%K A244559 nonn,base,changed
%O A244559 1,2
%A A244559 _Vincenzo Librandi_, Jul 03 2014