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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 5 |
| 2 | 55 |
| 3 | 430 |
| 4 | 2875 |
| 5 | 17506 |
| 6 | 100054 |
| 7 | 546076 |
| 8 | 2877139 |
| 9 | 14741786 |
| 10 | 73840002 |
| 11 | 362963908 |
| 12 | 1756073182 |
| 13 | 8381571028 |
| 14 | 39537088012 |
| 15 | 184595889208 |
| 16 | 854091531907 |
| 17 | 3920036136778 |
| 18 | 17862714586762 |
| 19 | 80870371149748 |
| 20 | 363985389650602 |
| 21 | 1629529723109308 |
| 22 | 7259813777148532 |
[0,5,55,430,2875,17506,100054,546076,2877139, 14741786,73840002,362963908,1756073182,8381571028, 39537088012,184595889208,854091531907, 3920036136778,17862714586762,80870371149748, 363985389650602,1629529723109308,7259813777148532] |