A001680 - OEIS

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A001680 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`2`
`3`		`5`
`4`		`14`
`5`		`46`
`6`		`166`
`7`		`652`
`8`		`2780`
`9`		`12644`
`10`		`61136`
`11`		`312676`
`12`		`1680592`
`13`		`9467680`
`14`		`55704104`
`15`		`341185496`
`16`		`2170853456`
`17`		`14314313872`
`18`		`97620050080`
`19`		`687418278544`
`20`		`4989946902176`
`21`		`37286121988256`
`22`		`286432845428192`
`23`		`2259405263572480`
`24`		`18280749571449664`
`25`		`151561941235370176`

[1,1,2,5,14,46,166,652,2780,12644,61136,312676, 1680592,9467680,55704104,341185496,2170853456, 14314313872,97620050080,687418278544, 4989946902176,37286121988256,286432845428192, 2259405263572480,18280749571449664, 151561941235370176]

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Last modified May 9 18:53 EDT 2024. Contains 372354 sequences. (Running on oeis4.)