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A229472 as a simple table

n a(n)
1 0
2 1
3 2
4 6
5 20
6 70
7 246
8 854
9 2920
10 9846
11 32810
12 108262
13 354300
14 1151462
15 3720094
16 11957430
17 38263760
18 121965718
19 387420498
20 1226831558
21 3874204900
22 12203745414
23 38354628422
24 120294061846
25 376572715320
26 1176789735350
27 3671583974266

[0,1,2,6,20,70,246,854,2920,9846,32810,108262,
 354300,1151462,3720094,11957430,38263760,
 121965718,387420498,1226831558,3874204900,
 12203745414,38354628422,120294061846,376572715320,
 1176789735350,3671583974266]

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Last modified July 27 14:47 EDT 2021. Contains 346307 sequences. (Running on oeis4.)