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First differences of indices of squarefree Catalan numbers.
0

%I #5 Dec 04 2017 21:35:30

%S 1,1,1,1,2,1,1,2,6,2,12,4

%N First differences of indices of squarefree Catalan numbers.

%C First differences of A080664. Next term is > 9965.

%t Differences[Position[CatalanNumber[Range[2,50]],_?SquareFreeQ]//Flatten] (* _Harvey P. Dale_, Dec 04 2017 *)

%Y Cf. A000108.

%K nonn

%O 0,5

%A _Paul Barry_, May 09 2005