A280309 - OEIS

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

A280309 as a simple table

`n`		`a(n)`
`1`		`0`
`2`		`0`
`3`		`0`
`4`		`1`
`5`		`2`
`6`		`9`
`7`		`34`
`8`		`124`
`9`		`432`
`10`		`1464`
`11`		`4848`
`12`		`15768`
`13`		`50528`
`14`		`159920`
`15`		`500832`
`16`		`1554304`
`17`		`4785664`
`18`		`14632704`
`19`		`44465664`
`20`		`134378112`
`21`		`404089344`
`22`		`1209699584`
`23`		`3606669824`
`24`		`10713166848`
`25`		`31713660928`
`26`		`93585811456`
`27`		`275367776256`
`28`		`808068888576`

[0,0,0,1,2,9,34,124,432,1464,4848,15768,50528, 159920,500832,1554304,4785664,14632704,44465664, 134378112,404089344,1209699584,3606669824, 10713166848,31713660928,93585811456,275367776256, 808068888576]

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 25 11:06 EDT 2024. Contains 371967 sequences. (Running on oeis4.)