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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 14 |
| 3 | 65 |
| 4 | 330 |
| 5 | 1683 |
| 6 | 8874 |
| 7 | 47088 |
| 8 | 253802 |
| 9 | 1375939 |
| 10 | 7524651 |
| 11 | 41346061 |
| 12 | 228447273 |
| 13 | 1267005772 |
| 14 | 7054307476 |
| 15 | 39394861448 |
| 16 | 220641191059 |
| 17 | 1238773724011 |
| 18 | 6970910527593 |
| 19 | 39305772011050 |
| 20 | 222039381179593 |
| 21 | 1256404002028860 |
| 22 | 7120347445063067 |
| 23 | 40409910873522737 |
| 24 | 229639109317630051 |
| 25 | 1306567259328079561 |
[1,3,14,65,330,1683,8874,47088,253802,1375939, 7524651,41346061,228447273,1267005772,7054307476, 39394861448,220641191059,1238773724011, 6970910527593,39305772011050,222039381179593, 1256404002028860,7120347445063067, 40409910873522737,229639109317630051, 1306567259328079561] |