A189734 - OEIS

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

A189734 as a simple table

`n`		`a(n)`
`1`		`2`
`2`		`5`
`3`		`20`
`4`		`65`
`5`		`230`
`6`		`785`
`7`		`2720`
`8`		`9365`
`9`		`32330`
`10`		`111485`
`11`		`384620`
`12`		`1326665`
`13`		`4576430`
`14`		`15786185`
`15`		`54454520`
`16`		`187839965`
`17`		`647952530`
`18`		`2235104885`
`19`		`7709972420`
`20`		`26595469265`
`21`		`91740800630`
`22`		`316458947585`
`23`		`1091621898320`
`24`		`3765538534565`
`25`		`12989186560730`
`26`		`44806065794285`

[2,5,20,65,230,785,2720,9365,32330,111485,384620, 1326665,4576430,15786185,54454520,187839965, 647952530,2235104885,7709972420,26595469265, 91740800630,316458947585,1091621898320, 3765538534565,12989186560730,44806065794285]

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 25 04:42 EDT 2024. Contains 371964 sequences. (Running on oeis4.)