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A012821 as a simple table

n a(n)
0 1
1 1
2 1
3 3
4 9
5 45
6 225
7 1071
8 6993
9 56697
10 467745
11 3279419
12 29529753
13 376156261
14 4297350785
15 35274762407
16 378759492257
17 8003761282417
18 122599030798017
19 853554115621363
20 8002975063348265
21 450081179390735645

[1,1,1,3,9,45,225,1071,6993,56697,467745,3279419,
 29529753,376156261,4297350785,35274762407,
 378759492257,8003761282417,122599030798017,
 853554115621363,8002975063348265,
 450081179390735645]

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Last modified September 30 17:27 EDT 2022. Contains 357106 sequences. (Running on oeis4.)