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A244746
Numbers obtained by concatenating the squares of the digits of Catalan(n).
0
1, 1, 4, 25, 116, 164, 194, 16481, 11690, 1664364, 136498136, 2564496436, 4064014, 491648100, 436491616160, 81368116641625, 9259254936490, 148136161649810, 164949369644900, 149364943691810, 362536161401640, 41616363643649040, 811166442536936160
OFFSET
0,3
FORMULA
a(n) = A048385(A000108(n)).
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
Sequence in context: A359524 A070764 A327646 * A110051 A334551 A273023
KEYWORD
nonn,base
AUTHOR
Vincenzo Librandi, Jul 05 2014
STATUS
approved