A107042 First differences of indices of squarefree Catalan numbers.

1, 1, 1, 1, 2, 1, 1, 2, 6, 2, 12, 4

Offset

0,5

Comments

First differences of A080664. Next term is > 9965.

Links

Table of n, a(n) for n=0..11.

Mathematica

Differences[Position[CatalanNumber[Range[2, 50]], _?SquareFreeQ]//Flatten] (* Harvey P. Dale, Dec 04 2017 *)

Crossrefs

Cf. A000108.

Sequence in context: A298608 A327815 A007736 * A134830 A319031 A022874

Adjacent sequences: A107039 A107040 A107041 * A107043 A107044 A107045

Keyword

nonn

Author

Paul Barry, May 09 2005

Status

approved