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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 79 |
| 5 | 364 |
| 6 | 1811 |
| 7 | 9272 |
| 8 | 48993 |
| 9 | 264819 |
| 10 | 1459111 |
| 11 | 8168870 |
| 12 | 46354854 |
| 13 | 266122198 |
| 14 | 1543286620 |
| 15 | 9029379641 |
| 16 | 53243769463 |
| 17 | 316161637203 |
| 18 | 1889148487909 |
| 19 | 11352026514978 |
| 20 | 68565004825620 |
| 21 | 416059778720095 |
| 22 | 2535484046258784 |
| 23 | 15511973547395972 |
| 24 | 95244796176063627 |
| 25 | 586766962036461554 |
[1,1,5,17,79,364,1811,9272,48993,264819,1459111, 8168870,46354854,266122198,1543286620,9029379641, 53243769463,316161637203,1889148487909, 11352026514978,68565004825620,416059778720095, 2535484046258784,15511973547395972, 95244796176063627,586766962036461554] |