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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 20 |
| 5 | 106 |
| 6 | 618 |
| 7 | 4358 |
| 8 | 34836 |
| 9 | 313592 |
| 10 | 3135988 |
| 11 | 34498646 |
| 12 | 414007634 |
| 13 | 5382362086 |
| 14 | 75356174332 |
| 15 | 1130382058576 |
| 16 | 18086649408624 |
| 17 | 307480839465174 |
| 18 | 5534775895914982 |
| 19 | 105162728081809146 |
| 20 | 2103289132221173216 |
| 21 | 44169707042511725964 |
| 22 | 971745847021319655464 |
| 23 | 22350404337704558809666 |
[0,1,1,6,20,106,618,4358,34836,313592,3135988, 34498646,414007634,5382362086,75356174332, 1130382058576,18086649408624,307480839465174, 5534775895914982,105162728081809146, 2103289132221173216,44169707042511725964, 971745847021319655464,22350404337704558809666] |