A006173 - OEIS

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

A006173 as a simple table

`n`		`a(n)`
`1`		`2`
`2`		`1`
`3`		`4`
`4`		`13`
`5`		`44`
`6`		`135`
`7`		`472`
`8`		`1492`
`9`		`5324`
`10`		`17405`
`11`		`63944`
`12`		`215096`
`13`		`799416`
`14`		`2752909`
`15`		`10310384`
`16`		`36443256`
`17`		`137263244`
`18`		`489166324`
`19`		`1860249448`
`20`		`6739795717`
`21`		`25596173800`
`22`		`93596253769`
`23`		`357974884304`
`24`		`1319325363658`
`25`		`5056389932088`

[2,1,4,13,44,135,472,1492,5324,17405,63944,215096, 799416,2752909,10310384,36443256,137263244, 489166324,1860249448,6739795717,25596173800, 93596253769,357974884304,1319325363658, 5056389932088]

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 25 05:18 EDT 2024. Contains 371964 sequences. (Running on oeis4.)