A005558 - 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.

A005558 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`3`
`3`		`6`
`4`		`20`
`5`		`50`
`6`		`175`
`7`		`490`
`8`		`1764`
`9`		`5292`
`10`		`19404`
`11`		`60984`
`12`		`226512`
`13`		`736164`
`14`		`2760615`
`15`		`9202050`
`16`		`34763300`
`17`		`118195220`
`18`		`449141836`
`19`		`1551580888`
`20`		`5924217936`
`21`		`20734762776`
`22`		`79483257308`
`23`		`281248448936`
`24`		`1081724803600`
`25`		`3863302870000`
`26`		`14901311070000`
`27`		`53644719852000`

[1,1,3,6,20,50,175,490,1764,5292,19404,60984, 226512,736164,2760615,9202050,34763300,118195220, 449141836,1551580888,5924217936,20734762776, 79483257308,281248448936,1081724803600, 3863302870000,14901311070000,53644719852000]

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 11 08:50 EDT 2024. Contains 373295 sequences. (Running on oeis4.)