OFFSET
0,3
EXAMPLE
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.
MATHEMATICA
Table[FromDigits[Flatten[IntegerDigits/@(IntegerDigits[ CatalanNumber[ n]]^2)]], {n, 0, 30}] (* Harvey P. Dale, Sep 23 2020 *)
PROG
(Magma) [StringToInteger(&cat[IntegerToString(h): h in Reverse([i^2: i in Intseq(Catalan(n))])]): n in [0..30]];
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Vincenzo Librandi, Jul 05 2014
STATUS
approved