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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 23 |
| 5 | 75 |
| 6 | 278 |
| 7 | 1155 |
| 8 | 5295 |
| 9 | 26442 |
| 10 | 142417 |
| 11 | 820987 |
| 12 | 5034584 |
| 13 | 32679021 |
| 14 | 223578343 |
| 15 | 1606536888 |
| 16 | 12086679035 |
| 17 | 94951548839 |
| 18 | 777028354998 |
| 19 | 6609770560055 |
| 20 | 58333928795427 |
| 21 | 533203744952178 |
| 22 | 5039919483399501 |
| 23 | 49191925338483847 |
| 24 | 495150794633289136 |
[1,3,8,23,75,278,1155,5295,26442,142417,820987, 5034584,32679021,223578343,1606536888,12086679035, 94951548839,777028354998,6609770560055, 58333928795427,533203744952178,5039919483399501, 49191925338483847,495150794633289136] |