A020057 - OEIS

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

A020057 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`0`
`2`		`0`
`3`		`0`
`4`		`2`
`5`		`11`
`6`		`58`
`7`		`364`
`8`		`2653`
`9`		`21951`
`10`		`203550`
`11`		`2091015`
`12`		`23571444`
`13`		`289285911`
`14`		`3839613003`
`15`		`54801749236`
`16`		`836972170164`
`17`		`13619819859947`
`18`		`235251433944553`
`19`		`4298685292986837`
`20`		`82847389283019056`
`21`		`1679542528192113596`

[1,0,0,0,2,11,58,364,2653,21951,203550,2091015, 23571444,289285911,3839613003,54801749236, 836972170164,13619819859947,235251433944553, 4298685292986837,82847389283019056, 1679542528192113596]

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 23 10:29 EDT 2024. Contains 371905 sequences. (Running on oeis4.)