A291031 - OEIS

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A291031 as a simple table

`n`		`a(n)`
`0`		`3`
`1`		`15`
`2`		`70`
`3`		`321`
`4`		`1461`
`5`		`6624`
`6`		`29967`
`7`		`135399`
`8`		`611318`
`9`		`2758881`
`10`		`12447753`
`11`		`56154744`
`12`		`253306119`
`13`		`1142572767`
`14`		`5153589754`
`15`		`23244956169`
`16`		`104843981505`
`17`		`472885383744`
`18`		`2132882300571`
`19`		`9620044596687`
`20`		`43389716584682`
`21`		`195702453488433`
`22`		`882684641446989`
`23`		`3981207177094608`

[3,15,70,321,1461,6624,29967,135399,611318, 2758881,12447753,56154744,253306119,1142572767, 5153589754,23244956169,104843981505,472885383744, 2132882300571,9620044596687,43389716584682, 195702453488433,882684641446989,3981207177094608]

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Last modified February 21 01:12 EST 2019. Contains 320364 sequences. (Running on oeis4.)