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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 51 |
| 5 | 205 |
| 6 | 792 |
| 7 | 3107 |
| 8 | 12117 |
| 9 | 47362 |
| 10 | 184965 |
| 11 | 722591 |
| 12 | 2822544 |
| 13 | 11025793 |
| 14 | 43069611 |
| 15 | 168242270 |
| 16 | 657200859 |
| 17 | 2567211037 |
| 18 | 10028243016 |
| 19 | 39173122739 |
| 20 | 153021167805 |
| 21 | 597743469778 |
| 22 | 2334953116653 |
| 23 | 9120979734623 |
| 24 | 35629097057568 |
[0,1,3,14,51,205,792,3107,12117,47362,184965, 722591,2822544,11025793,43069611,168242270, 657200859,2567211037,10028243016,39173122739, 153021167805,597743469778,2334953116653, 9120979734623,35629097057568] |