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A272988 as a simple table

n a(n)
0 1
1 0
2 2
3 4
4 19
5 92
6 552
7 3832
8 30453
9 272552
10 2713710
11 29752156
12 356133959
13 4620985700
14 64600445812
15 967927029168
16 15473320537001
17 262864036323600
18 4728905854617562
19 89808092596277364
20 1795480569403712699
21 37693097921348983852
22 829024574048725950016
23 19063166411687276701736

[1,0,2,4,19,92,552,3832,30453,272552,2713710,
 29752156,356133959,4620985700,64600445812,
 967927029168,15473320537001,262864036323600,
 4728905854617562,89808092596277364,
 1795480569403712699,37693097921348983852,
 829024574048725950016,19063166411687276701736]

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Last modified November 21 11:30 EST 2018. Contains 317447 sequences. (Running on oeis4.)