A008420 - OEIS

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

A008420 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`20`
`2`		`200`
`3`		`1340`
`4`		`6800`
`5`		`28004`
`6`		`97880`
`7`		`299660`
`8`		`822560`
`9`		`2060980`
`10`		`4780008`
`11`		`10377180`
`12`		`21278640`
`13`		`41517060`
`14`		`77548920`
`15`		`139380012`
`16`		`242080320`
`17`		`407782740`
`18`		`668274440`
`19`		`1068305020`
`20`		`1669752016`
`21`		`2556801700`
`22`		`3842321560`
`23`		`5675620300`

[1,20,200,1340,6800,28004,97880,299660,822560, 2060980,4780008,10377180,21278640,41517060, 77548920,139380012,242080320,407782740,668274440, 1068305020,1669752016,2556801700,3842321560, 5675620300]

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)