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A228569 as a simple table

n a(n)
0 2
1 5
2 19
3 80
4 343
5 1475
6 6346
7 27305
8 117487
9 505520
10 2175139
11 9359135
12 40270258
13 173273885
14 745558651
15 3207971600
16 13803182047
17 59391995435
18 255550431034
19 1099576168865
20 4731229551223
21 20357419249520
22 87593407593931
23 376894780221095
24 1621693678323682

[2,5,19,80,343,1475,6346,27305,117487,505520,
 2175139,9359135,40270258,173273885,745558651,
 3207971600,13803182047,59391995435,255550431034,
 1099576168865,4731229551223,20357419249520,
 87593407593931,376894780221095,1621693678323682]

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Last modified January 25 04:27 EST 2021. Contains 340416 sequences. (Running on oeis4.)