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A221420 as a simple table

`n`		`a(n)`
`1`		`0`
`2`		`4`
`3`		`10`
`4`		`29`
`5`		`84`
`6`		`242`
`7`		`696`
`8`		`2000`
`9`		`5744`
`10`		`16492`
`11`		`47344`
`12`		`135900`
`13`		`390080`
`14`		`1119636`
`15`		`3213616`
`16`		`9223756`
`17`		`26474016`
`18`		`75985524`
`19`		`218092816`
`20`		`625967180`
`21`		`1796642240`
`22`		`5156696372`
`23`		`14800673136`
`24`		`42480669068`
`25`		`121927372384`
`26`		`349954089588`

[0,4,10,29,84,242,696,2000,5744,16492,47344, 135900,390080,1119636,3213616,9223756,26474016, 75985524,218092816,625967180,1796642240, 5156696372,14800673136,42480669068,121927372384, 349954089588]

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Last modified September 11 23:47 EDT 2024. Contains 375842 sequences. (Running on oeis4.)