A137340 - OEIS

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A137340 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`9`
`2`		`21`
`3`		`69`
`4`		`201`
`5`		`609`
`6`		`1821`
`7`		`5469`
`8`		`16401`
`9`		`49209`
`10`		`147621`
`11`		`442869`
`12`		`1328601`
`13`		`3985809`
`14`		`11957421`
`15`		`35872269`
`16`		`107616801`
`17`		`322850409`
`18`		`968551221`
`19`		`2905653669`
`20`		`8716961001`
`21`		`26150883009`
`22`		`78452649021`
`23`		`235357947069`
`24`		`706073841201`
`25`		`2118221523609`
`26`		`6354664570821`
`27`		`19063993712469`

[1,9,21,69,201,609,1821,5469,16401,49209,147621, 442869,1328601,3985809,11957421,35872269, 107616801,322850409,968551221,2905653669, 8716961001,26150883009,78452649021,235357947069, 706073841201,2118221523609,6354664570821, 19063993712469]

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Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)