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A001028 as a simple table

n a(n)
1 1
2 1
3 2
4 7
5 37
6 269
7 2535
8 29738
9 421790
10 7076459
11 138061343
12 3089950076
13 78454715107
14 2238947459974
15 71253947372202
16 2511742808382105
17 97495087989736907
18 4145502184671892500
19 192200099033324115855
20 9676409879981926733908
21 527029533717566423156698

[1,1,2,7,37,269,2535,29738,421790,7076459,
 138061343,3089950076,78454715107,2238947459974,
 71253947372202,2511742808382105,97495087989736907,
 4145502184671892500,192200099033324115855,
 9676409879981926733908,527029533717566423156698]

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Last modified October 22 04:25 EDT 2019. Contains 328315 sequences. (Running on oeis4.)