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A011966 as a simple table

n a(n)
0 1
1 5
2 20
3 87
4 409
5 2066
6 11155
7 64077
8 389946
9 2504665
10 16923381
11 119928232
12 888980293
13 6876320041
14 55382419676
15 463539664643
16 4024626253845
17 36189297168874
18 336513491259647
19 3231446022478129
20 32004743929977258
21 326548129128737469
22 3428663026172389201

[1,5,20,87,409,2066,11155,64077,389946,2504665,
 16923381,119928232,888980293,6876320041,
 55382419676,463539664643,4024626253845,
 36189297168874,336513491259647,3231446022478129,
 32004743929977258,326548129128737469,
 3428663026172389201]

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Last modified June 5 18:48 EDT 2020. Contains 334854 sequences. (Running on oeis4.)