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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 5 |
| 5 | 13 |
| 6 | 203 |
| 7 | 877 |
| 8 | 23 |
| 9 | 1007 |
| 10 | 4639 |
| 11 | 22619 |
| 12 | 4213597 |
| 13 | 27644437 |
| 14 | 95449661 |
| 15 | 276591709 |
| 16 | 10480142147 |
| 17 | 255755771 |
| 18 | 97439543737 |
| 19 | 5832742205057 |
| 20 | 263898766507 |
| 21 | 158289938718917 |
| 22 | 88366975263673 |
| 23 | 22076002927542173 |
| 24 | 148652956431601763 |
| 25 | 356814640940769181 |
[1,1,1,5,5,13,203,877,23,1007,4639,22619,4213597, 27644437,95449661,276591709,10480142147,255755771, 97439543737,5832742205057,263898766507, 158289938718917,88366975263673,22076002927542173, 148652956431601763,356814640940769181] |