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

0,2

Comments

Lengths of Dyck paths (A162549).

Links

Table of n, a(n) for n=0..76.

Formula

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

Crossrefs

Cf. A162549, A072643, A000108.

Sequence in context: A058043 A251546 A282894 * A191682 A113724 A161794

Adjacent sequences: A162547 A162548 A162549 * A162551 A162552 A162553

Keyword

nonn

Author

Franklin T. Adams-Watters, Jul 05 2009

Status

approved