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A218088 as a simple table

n a(n)
2 2
3 4
4 8
5 20
6 52
7 140
8 400
9 1204
10 3808
11 12634
12 43772
13 157822
14 590518
15 2287070
16 9148286
17 37719354
18 160029668
19 697553152
20 3119552536
21 14295585636
22 67052240164
23 321571247090
24 1575370942644

[2,4,8,20,52,140,400,1204,3808,12634,43772,157822,
 590518,2287070,9148286,37719354,160029668,
 697553152,3119552536,14295585636,67052240164,
 321571247090,1575370942644]

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Last modified June 23 18:45 EDT 2021. Contains 345402 sequences. (Running on oeis4.)