A002420 - OEIS

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

A002420 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`-2`
`2`		`-2`
`3`		`-4`
`4`		`-10`
`5`		`-28`
`6`		`-84`
`7`		`-264`
`8`		`-858`
`9`		`-2860`
`10`		`-9724`
`11`		`-33592`
`12`		`-117572`
`13`		`-416024`
`14`		`-1485800`
`15`		`-5348880`
`16`		`-19389690`
`17`		`-70715340`
`18`		`-259289580`
`19`		`-955277400`
`20`		`-3534526380`
`21`		`-13128240840`
`22`		`-48932534040`
`23`		`-182965127280`
`24`		`-686119227300`
`25`		`-2579808294648`
`26`		`-9723892802904`
`27`		`-36734706144304`

[1,-2,-2,-4,-10,-28,-84,-264,-858,-2860,-9724, -33592,-117572,-416024,-1485800,-5348880, -19389690,-70715340,-259289580,-955277400, -3534526380,-13128240840,-48932534040, -182965127280,-686119227300,-2579808294648, -9723892802904,-36734706144304]

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 12 05:37 EDT 2024. Contains 372431 sequences. (Running on oeis4.)