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A158889 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 23 |
| 5 | 205 |
| 6 | 3833 |
| 7 | 148051 |
| 8 | 11761606 |
| 9 | 1909231503 |
| 10 | 632185554036 |
| 11 | 427306055229923 |
| 12 | 589583957310155426 |
| 13 | 1662328104286133851880 |
| 14 | 9585835617647933412333536 |
| 15 | 113145883593065457861894176545 |
[1,1,2,5,23,205,3833,148051,11761606,1909231503, 632185554036,427306055229923,589583957310155426, 1662328104286133851880,9585835617647933412333536, 113145883593065457861894176545] |