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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 29 |
| 5 | 104 |
| 6 | 405 |
| 7 | 1634 |
| 8 | 6788 |
| 9 | 28922 |
| 10 | 125559 |
| 11 | 554058 |
| 12 | 2474920 |
| 13 | 11188064 |
| 14 | 51025586 |
| 15 | 234609810 |
| 16 | 1086430868 |
| 17 | 5061096381 |
| 18 | 23702973326 |
| 19 | 111544459533 |
| 20 | 527097647852 |
| 21 | 2500077258967 |
| 22 | 11898645626830 |
| 23 | 56798990784424 |
| 24 | 271874618573959 |
| 25 | 1304627798728260 |
| 26 | 6274476702322705 |
| 27 | 30238642580810987 |
[1,1,3,8,29,104,405,1634,6788,28922,125559,554058, 2474920,11188064,51025586,234609810,1086430868, 5061096381,23702973326,111544459533,527097647852, 2500077258967,11898645626830,56798990784424, 271874618573959,1304627798728260,6274476702322705, 30238642580810987] |