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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 11 |
| 4 | 115 |
| 5 | 241 |
| 6 | 1079 |
| 7 | 1320 |
| 8 | 56519 |
| 9 | 57839 |
| 10 | 287875 |
| 11 | 633589 |
| 12 | 6623765 |
| 13 | 13881119 |
| 14 | 62148241 |
| 15 | 76029360 |
| 16 | 3255381361 |
| 17 | 3331410721 |
| 18 | 16581024245 |
| 19 | 36493459211 |
| 20 | 381515616355 |
| 21 | 799524691921 |
| 22 | 3579614384039 |
| 23 | 4379139075960 |
| 24 | 187503455574359 |
| 25 | 191882594650319 |
[1,1,5,11,115,241,1079,1320,56519,57839,287875, 633589,6623765,13881119,62148241,76029360, 3255381361,3331410721,16581024245,36493459211, 381515616355,799524691921,3579614384039, 4379139075960,187503455574359,191882594650319] |