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A060223 as a simple table

n a(n)
0 1
1 1
2 1
3 4
4 18
5 108
6 778
7 6756
8 68220
9 787472
10 10224702
11 147512052
12 2340963570
13 40527565260
14 760095923082
15 15352212731820
16 332228417589720
17 7668868648772700
18 188085259069430744
19 4884294069438337428
20 133884389812214097774
21 3863086904690670182596

[1,1,1,4,18,108,778,6756,68220,787472,10224702,
 147512052,2340963570,40527565260,760095923082,
 15352212731820,332228417589720,7668868648772700,
 188085259069430744,4884294069438337428,
 133884389812214097774,3863086904690670182596]

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Last modified September 21 02:46 EDT 2020. Contains 337266 sequences. (Running on oeis4.)