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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 8 |
| 2 | 20 |
| 3 | 47 |
| 4 | 109 |
| 5 | 253 |
| 6 | 588 |
| 7 | 1367 |
| 8 | 3178 |
| 9 | 7388 |
| 10 | 17175 |
| 11 | 39927 |
| 12 | 92819 |
| 13 | 215778 |
| 14 | 501623 |
| 15 | 1166132 |
| 16 | 2710928 |
| 17 | 6302143 |
| 18 | 14650705 |
| 19 | 34058757 |
| 20 | 79177004 |
| 21 | 184064203 |
| 22 | 427897358 |
| 23 | 994740672 |
| 24 | 2312491503 |
| 25 | 5375890523 |
| 26 | 12497429235 |
| 27 | 29052998162 |
| 28 | 67540026539 |
| 29 | 157011512528 |
[3,8,20,47,109,253,588,1367,3178,7388,17175,39927, 92819,215778,501623,1166132,2710928,6302143, 14650705,34058757,79177004,184064203,427897358, 994740672,2312491503,5375890523,12497429235, 29052998162,67540026539,157011512528] |