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A284416 as a simple table

n a(n)
0 1
1 1
2 1
3 7
4 17
5 116
6 536
7 3732
8 21609
9 152225
10 991680
11 7142207
12 49671146
13 364955208
14 2644449147
15 19764753353
16 147264417970
17 1116423286310
18 8488332597668
19 65109780090520
20 502742629038600
21 3893865922507871
22 30436537169536769
23 237651376621912220

[1,1,1,7,17,116,536,3732,21609,152225,991680,
 7142207,49671146,364955208,2644449147,19764753353,
 147264417970,1116423286310,8488332597668,
 65109780090520,502742629038600,3893865922507871,
 30436537169536769,237651376621912220]

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Last modified August 10 12:39 EDT 2020. Contains 336379 sequences. (Running on oeis4.)