A000781 - OEIS

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A000781 as a simple table

`n`		`a(n)`
`1`		`1`
`2`		`4`
`3`		`12`
`4`		`36`
`5`		`111`
`6`		`353`
`7`		`1154`
`8`		`3860`
`9`		`13155`
`10`		`45525`
`11`		`159561`
`12`		`565249`
`13`		`2020687`
`14`		`7280419`
`15`		`26410094`
`16`		`96378164`
`17`		`353576699`
`18`		`1303271309`
`19`		`4824150869`
`20`		`17925098069`
`21`		`66834680639`
`22`		`249981423899`
`23`		`937696277309`
`24`		`3526652828321`
`25`		`13295935057031`
`26`		`50240112815003`

[1,4,12,36,111,353,1154,3860,13155,45525,159561, 565249,2020687,7280419,26410094,96378164, 353576699,1303271309,4824150869,17925098069, 66834680639,249981423899,937696277309, 3526652828321,13295935057031,50240112815003]

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