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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 29 |
| 5 | 57 |
| 6 | 590 |
| 7 | 1628 |
| 8 | 11731 |
| 9 | 39459 |
| 10 | 236797 |
| 11 | 899155 |
| 12 | 4863068 |
| 13 | 19903896 |
| 14 | 101199149 |
| 15 | 433857437 |
| 16 | 2124952045 |
| 17 | 9374498133 |
| 18 | 44879983186 |
| 19 | 201514230964 |
| 20 | 951385817327 |
| 21 | 4318344961935 |
| 22 | 20214336758573 |
| 23 | 92366228744351 |
| 24 | 430111736709904 |
[0,1,1,29,57,590,1628,11731,39459,236797,899155, 4863068,19903896,101199149,433857437,2124952045, 9374498133,44879983186,201514230964,951385817327, 4318344961935,20214336758573,92366228744351, 430111736709904] |