A374647 a(n) = n! / floor(2n/3)!.

1, 1, 2, 3, 12, 20, 30, 210, 336, 504, 5040, 7920, 11880, 154440, 240240, 360360, 5765760, 8910720, 13366080, 253955520, 390700800, 586051200, 12893126400, 19769460480, 29654190720, 741354768000, 1133836704000, 1700755056000, 47621141568000, 72684900288000

Offset

0,3

Links

Table of n, a(n) for n=0..29.

Mathematica

Table[n!/(Floor[2 n/3]!), {n, 0, 30}]

Crossrefs

Cf. A000142, A081125, A355988.

Sequence in context: A140989 A281086 A355847 * A130089 A323119 A307035

Adjacent sequences: A374644 A374645 A374646 * A374648 A374649 A374650

Keyword

nonn

Author

Clark Kimberling, Jul 22 2024

Status

approved