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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 37 |
| 4 | 151 |
| 5 | 674 |
| 6 | 3263 |
| 7 | 17007 |
| 8 | 94828 |
| 9 | 562595 |
| 10 | 3535027 |
| 11 | 23430840 |
| 12 | 163254885 |
| 13 | 1192059223 |
| 14 | 9097183602 |
| 15 | 72384727657 |
| 16 | 599211936355 |
| 17 | 5150665398898 |
| 18 | 45891416030315 |
| 19 | 423145657921379 |
| 20 | 4031845922290572 |
| 21 | 39645290116637023 |
| 22 | 401806863439720943 |
| 23 | 4192631462935194064 |
[1,3,10,37,151,674,3263,17007,94828,562595, 3535027,23430840,163254885,1192059223,9097183602, 72384727657,599211936355,5150665398898, 45891416030315,423145657921379,4031845922290572, 39645290116637023,401806863439720943, 4192631462935194064] |