A170829 a(n) = gcd(Catalan(n), n!).

1, 1, 2, 1, 2, 6, 12, 3, 10, 2, 4, 14, 28, 100, 360, 45, 90, 330, 23100, 2310, 8580, 780, 1560, 5850, 468, 1764, 6664, 476, 52360, 198968, 397936, 24871, 94962, 363090, 20748, 79534, 159068, 8372, 32200, 123970, 247940, 956340, 1912680, 7389900, 28574280, 1242360

Offset

0,3

Links

Table of n, a(n) for n=0..45.

Mathematica

Table[GCD[CatalanNumber[n], n!], {n, 0, 50}] (* Harvey P. Dale, Jun 22 2022 *)

Crossrefs

Cf. A000108.

Sequence in context: A307519 A254198 A246466 * A032085 A032163 A038078

Adjacent sequences: A170826 A170827 A170828 * A170830 A170831 A170832

Keyword

nonn

Author

N. J. A. Sloane, Dec 28 2009

Status

approved