A177482 Suppose e

1, 1, 2, 6, 20, 80, 360, 1888, 11168, 75168, 560960, 4632320, 41627520, 405993472, 4256566784, 47855992320, 573443425280, 7304885964800, 98493107742720, 1402190308089856, 21008850635694080, 330557870033510400, 5448181151148032000, 93883859983130624000

Offset: 0

Author

Signy Olafsdottir (signy06(AT)ru.is), May 09 2010

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..100
• S. Kitaev, Introduction to partially ordered patterns, Discrete Applied Mathematics 155 (2007), 929-944.

Extensions

a(0)=1, a(10)-a(23) from Alois P. Heinz, Mar 10 2020