A007580 - OEIS

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A007580 as a simple table

`n`		`a(n)`
`1`		`1`
`2`		`2`
`3`		`4`
`4`		`10`
`5`		`26`
`6`		`76`
`7`		`232`
`8`		`764`
`9`		`2619`
`10`		`9486`
`11`		`35596`
`12`		`139392`
`13`		`562848`
`14`		`2352064`
`15`		`10092160`
`16`		`44546320`
`17`		`201158620`
`18`		`930213752`
`19`		`4387327088`
`20`		`21115314916`
`21`		`103386386516`
`22`		`515097746072`
`23`		`2605341147472`
`24`		`13378787264584`
`25`		`69622529312665`
`26`		`367161088308490`
`27`		`1959294979429380`

[1,2,4,10,26,76,232,764,2619,9486,35596,139392, 562848,2352064,10092160,44546320,201158620, 930213752,4387327088,21115314916,103386386516, 515097746072,2605341147472,13378787264584, 69622529312665,367161088308490,1959294979429380]

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Last modified May 24 13:46 EDT 2013. Contains 225621 sequences.