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A020128 as a simple table

n a(n)
0 1
1 1
2 1
3 3
4 9
5 42
6 232
7 1528
8 11611
9 99851
10 958562
11 10160756
12 117864769
13 1485096082
14 20197306709
15 294880677942
16 4600138575888
17 76362300359741
18 1343976486331426
19 24997962645764523
20 489960067856984639

[1,1,1,3,9,42,232,1528,11611,99851,958562,
 10160756,117864769,1485096082,20197306709,
 294880677942,4600138575888,76362300359741,
 1343976486331426,24997962645764523,
 489960067856984639]

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Last modified March 28 13:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)