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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 41 |
| 4 | 168 |
| 5 | 727 |
| 6 | 3219 |
| 7 | 14385 |
| 8 | 65613 |
| 9 | 300679 |
| 10 | 1392830 |
| 11 | 6492134 |
| 12 | 30415783 |
| 13 | 143309584 |
| 14 | 677504561 |
| 15 | 3216099178 |
| 16 | 15311310131 |
| 17 | 73103177454 |
| 18 | 349911386579 |
| 19 | 1678491213789 |
| 20 | 8068384917616 |
| 21 | 38852770111657 |
| 22 | 187412268123453 |
| 23 | 905363554615997 |
| 24 | 4379869444310765 |
| 25 | 21215628878755604 |
| 26 | 102888394500800977 |
[1,3,10,41,168,727,3219,14385,65613,300679, 1392830,6492134,30415783,143309584,677504561, 3216099178,15311310131,73103177454,349911386579, 1678491213789,8068384917616,38852770111657, 187412268123453,905363554615997,4379869444310765, 21215628878755604,102888394500800977] |