A192458 a(n) = A192457(n)/2.

0, 1, 7, 59, 605, 7365, 104055, 1675275, 30290085, 607828725, 13406691375, 322415322075, 8396547684525, 235419569309925, 7070492932878375, 226469231898784875, 7706144167912315125, 277613088828805855125, 10555630035365385345375

Offset: 0

Author

Clark Kimberling, Jul 01 2011

Keywords

• nonn

Comments

See A192457.

Examples

			(See A192457.)
		

Crossrefs

Cf. A192457.

Programs

Mathematica

(See A192457.)

Formula

a(n) = (1/3)*(2^n(n+1)! - (2n-1)!!). - Vaclav Potocek, Feb 04 2016