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A229886 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 1
5 1
6 1
7 6
8 21
9 56
10 126
11 252
12 2562
13 14442
14 59487
15 199627
16 578005
17 8330800
18 65056960
19 363823800
20 1628423880
21 6190034016
22 115452938151
23 1152005977431
24 8137667253101
25 45527993728141
26 214265281290061
27 4904624749585886
28 59578069604921361

[1,1,1,1,1,1,1,6,21,56,126,252,2562,14442,59487,
 199627,578005,8330800,65056960,363823800,
 1628423880,6190034016,115452938151,1152005977431,
 8137667253101,45527993728141,214265281290061,
 4904624749585886,59578069604921361]

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Last modified January 20 19:53 EST 2020. Contains 331096 sequences. (Running on oeis4.)