A026990 - OEIS

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A026990 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`3`
`2`		`10`
`3`		`30`
`4`		`78`
`5`		`189`
`6`		`480`
`7`		`1242`
`8`		`3030`
`9`		`7084`
`10`		`17112`
`11`		`42146`
`12`		`99792`
`13`		`229065`
`14`		`540544`
`15`		`1298851`
`16`		`3025386`
`17`		`6871084`
`18`		`15993500`
`19`		`37857267`
`20`		`87275980`
`21`		`196867143`
`22`		`454118616`
`23`		`1064055225`
`24`		`2435780334`
`25`		`5468505723`
`26`		`12533827796`
`27`		`29153115186`

[1,3,10,30,78,189,480,1242,3030,7084,17112,42146, 99792,229065,540544,1298851,3025386,6871084, 15993500,37857267,87275980,196867143,454118616, 1064055225,2435780334,5468505723,12533827796, 29153115186]

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Last modified April 23 15:20 EDT 2024. Contains 371916 sequences. (Running on oeis4.)