A064649 - OEIS

The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.

The OEIS is supported by the many generous donors to the OEIS Foundation.

A064649 as a simple table

`n`		`a(n)`
`1`		`1`
`2`		`4`
`3`		`12`
`4`		`40`
`5`		`140`
`6`		`816`
`7`		`5082`
`8`		`40800`
`9`		`363258`
`10`		`3632880`
`11`		`39916910`
`12`		`479052528`
`13`		`6227020956`
`14`		`87178936992`
`15`		`1307674429440`
`16`		`20922800222848`
`17`		`355687428096272`
`18`		`6402373892575992`
`19`		`121645100408832342`
`20`		`2432902011892837920`

[1,4,12,40,140,816,5082,40800,363258,3632880, 39916910,479052528,6227020956,87178936992, 1307674429440,20922800222848,355687428096272, 6402373892575992,121645100408832342, 2432902011892837920]

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 14 07:57 EDT 2024. Contains 372530 sequences. (Running on oeis4.)