A172405 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A172405 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`2`
`3`		`5`
`4`		`15`
`5`		`47`
`6`		`153`
`7`		`515`
`8`		`1782`
`9`		`6293`
`10`		`22576`
`11`		`82043`
`12`		`301417`
`13`		`1117693`
`14`		`4177687`
`15`		`15723545`
`16`		`59538258`
`17`		`226656336`
`18`		`866983080`
`19`		`3330496250`
`20`		`12843380569`
`21`		`49700905874`
`22`		`192942347560`
`23`		`751191150163`
`24`		`2932439491143`
`25`		`11475503589091`

[1,1,2,5,15,47,153,515,1782,6293,22576,82043, 301417,1117693,4177687,15723545,59538258, 226656336,866983080,3330496250,12843380569, 49700905874,192942347560,751191150163, 2932439491143,11475503589091]

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 19 07:38 EDT 2024. Contains 371782 sequences. (Running on oeis4.)