A162550 2n repeated C_n times, where C_n = A000108(n) is a Catalan number.

0, 2, 4, 4, 6, 6, 6, 6, 6, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12

Offset: 0

Author

Franklin T. Adams-Watters, Jul 05 2009

Keywords

• nonn

Comments

Lengths of Dyck paths (A162549).

Crossrefs

Cf. A162549, A072643, A000108.

Formula

a(n) = 2 * A072643(n).