A061981 - OEIS

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A061981 as a simple table

`n`		`a(n)`
`0`		`0`
`1`		`0`
`2`		`4`
`3`		`20`
`4`		`72`
`5`		`232`
`6`		`716`
`7`		`2172`
`8`		`6544`
`9`		`19664`
`10`		`59028`
`11`		`177124`
`12`		`531416`
`13`		`1594296`
`14`		`4782940`
`15`		`14348876`
`16`		`43046688`
`17`		`129140128`
`18`		`387420452`
`19`		`1162261428`
`20`		`3486784360`
`21`		`10460353160`
`22`		`31381059564`
`23`		`94143178780`
`24`		`282429536432`
`25`		`847288609392`

[0,0,4,20,72,232,716,2172,6544,19664,59028,177124, 531416,1594296,4782940,14348876,43046688, 129140128,387420452,1162261428,3486784360, 10460353160,31381059564,94143178780,282429536432, 847288609392]

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Last modified April 23 13:04 EDT 2024. Contains 371913 sequences. (Running on oeis4.)