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A189604 as a simple table

n a(n)
1 1
2 6
3 20
4 72
5 256
6 912
7 3248
8 11568
9 41200
10 146736
11 522608
12 1861296
13 6629104
14 23609904
15 84087920
16 299483568
17 1066626544
18 3798846768
19 13529793392
20 48187073712
21 171620807920
22 611236571184
23 2176951329392
24 7753327130544

[1,6,20,72,256,912,3248,11568,41200,146736,522608,
 1861296,6629104,23609904,84087920,299483568,
 1066626544,3798846768,13529793392,48187073712,
 171620807920,611236571184,2176951329392,
 7753327130544]

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Last modified June 24 21:16 EDT 2019. Contains 324337 sequences. (Running on oeis4.)