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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 42 |
| 4 | 163 |
| 5 | 638 |
| 6 | 2510 |
| 7 | 9908 |
| 8 | 39203 |
| 9 | 155382 |
| 10 | 616666 |
| 11 | 2449868 |
| 12 | 9740686 |
| 13 | 38754732 |
| 14 | 154276028 |
| 15 | 614429672 |
| 16 | 2448023843 |
| 17 | 9756737702 |
| 18 | 38897306018 |
| 19 | 155111585372 |
| 20 | 618679078298 |
| 21 | 2468152192772 |
| 22 | 9848142504068 |
| 23 | 39301087452632 |
| 24 | 156861290196878 |
| 25 | 626155256640188 |
[1,3,11,42,163,638,2510,9908,39203,155382,616666, 2449868,9740686,38754732,154276028,614429672, 2448023843,9756737702,38897306018,155111585372, 618679078298,2468152192772,9848142504068, 39301087452632,156861290196878,626155256640188] |