A123893 - OEIS

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

A123893 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`4`
`2`		`16`
`3`		`58`
`4`		`208`
`5`		`750`
`6`		`2708`
`7`		`9772`
`8`		`35256`
`9`		`127210`
`10`		`459012`
`11`		`1656228`
`12`		`5976040`
`13`		`21562946`
`14`		`77804232`
`15`		`280736004`
`16`		`1012961416`
`17`		`3655002994`
`18`		`13188110940`
`19`		`47585806908`
`20`		`171700784680`
`21`		`619536821778`
`22`		`2235434596432`
`23`		`8065973894524`
`24`		`29103931264328`
`25`		`105013830473538`

[1,4,16,58,208,750,2708,9772,35256,127210,459012, 1656228,5976040,21562946,77804232,280736004, 1012961416,3655002994,13188110940,47585806908, 171700784680,619536821778,2235434596432, 8065973894524,29103931264328,105013830473538]

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 19 16:52 EDT 2024. Contains 371794 sequences. (Running on oeis4.)