%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