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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 33 |
| 4 | 148 |
| 5 | 681 |
| 6 | 3207 |
| 7 | 15304 |
| 8 | 73793 |
| 9 | 358363 |
| 10 | 1749904 |
| 11 | 8580148 |
| 12 | 42207338 |
| 13 | 208156879 |
| 14 | 1028695705 |
| 15 | 5092223056 |
| 16 | 25241971267 |
| 17 | 125265601296 |
| 18 | 622231878859 |
| 19 | 3093281543257 |
| 20 | 15387946642130 |
| 21 | 76593647431680 |
| 22 | 381434671792829 |
| 23 | 1900349222963012 |
| 24 | 9471261945540459 |
| 25 | 47219646520069460 |
| 26 | 235483534853526993 |
[1,2,8,33,148,681,3207,15304,73793,358363,1749904, 8580148,42207338,208156879,1028695705,5092223056, 25241971267,125265601296,622231878859, 3093281543257,15387946642130,76593647431680, 381434671792829,1900349222963012,9471261945540459, 47219646520069460,235483534853526993] |