A120304 - OEIS

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A120304 as a simple table

`n`		`a(n)`
`0`		`-1`
`1`		`-1`
`2`		`0`
`3`		`3`
`4`		`12`
`5`		`40`
`6`		`130`
`7`		`427`
`8`		`1428`
`9`		`4860`
`10`		`16794`
`11`		`58784`
`12`		`208010`
`13`		`742898`
`14`		`2674438`
`15`		`9694843`
`16`		`35357668`
`17`		`129644788`
`18`		`477638698`
`19`		`1767263188`
`20`		`6564120418`
`21`		`24466267018`
`22`		`91482563638`
`23`		`343059613648`
`24`		`1289904147322`
`25`		`4861946401450`
`26`		`18367353072150`
`27`		`69533550916002`
`28`		`263747951750358`

[-1,-1,0,3,12,40,130,427,1428,4860,16794,58784, 208010,742898,2674438,9694843,35357668,129644788, 477638698,1767263188,6564120418,24466267018, 91482563638,343059613648,1289904147322, 4861946401450,18367353072150,69533550916002, 263747951750358]

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Last modified April 19 18:00 EDT 2024. Contains 371797 sequences. (Running on oeis4.)