A008643 - OEIS

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

A008643 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`2`
`3`		`2`
`4`		`4`
`5`		`4`
`6`		`6`
`7`		`6`
`8`		`10`
`9`		`10`
`10`		`14`
`11`		`14`
`12`		`20`
`13`		`20`
`14`		`26`
`15`		`26`
`16`		`35`
`17`		`35`
`18`		`44`
`19`		`44`
`20`		`56`
`21`		`56`
`22`		`68`
`23`		`68`
`24`		`84`
`25`		`84`
`26`		`100`
`27`		`100`
`28`		`120`
`29`		`120`
`30`		`140`
`31`		`140`
`32`		`165`
`33`		`165`
`34`		`190`
`35`		`190`
`36`		`220`
`37`		`220`
`38`		`250`
`39`		`250`
`40`		`286`
`41`		`286`
`42`		`322`
`43`		`322`
`44`		`364`
`45`		`364`
`46`		`406`
`47`		`406`
`48`		`455`
`49`		`455`
`50`		`504`
`51`		`504`
`52`		`560`
`53`		`560`
`54`		`616`
`55`		`616`
`56`		`680`
`57`		`680`
`58`		`744`

[1,1,2,2,4,4,6,6,10,10,14,14,20,20,26,26,35,35,44, 44,56,56,68,68,84,84,100,100,120,120,140,140,165, 165,190,190,220,220,250,250,286,286,322,322,364, 364,406,406,455,455,504,504,560,560,616,616,680, 680,744]

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 19 16:38 EDT 2024. Contains 371794 sequences. (Running on oeis4.)