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A291698 as a simple table

n a(n)
0 1
1 1
2 2
3 12
4 20
5 55
6 294
7 497
8 1224
9 2520
10 14410
11 21912
12 54300
13 104286
14 220710
15 1105215
16 1697552
17 3839382
18 7356762
19 14873580
20 26275620
21 132112596
22 188666126
23 423247104
24 772560600
25 1535398150
26 2632049290
27 4975242048
28 21273166572
29 30649985160
30 64824339630
31 116604788800
32 223181224992

[1,1,2,12,20,55,294,497,1224,2520,14410,21912,
 54300,104286,220710,1105215,1697552,3839382,
 7356762,14873580,26275620,132112596,188666126,
 423247104,772560600,1535398150,2632049290,
 4975242048,21273166572,30649985160,64824339630,
 116604788800,223181224992]

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Last modified April 20 12:58 EDT 2021. Contains 343135 sequences. (Running on oeis4.)