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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 61 |
| 3 | 130 |
| 4 | 1767 |
| 5 | 13314 |
| 6 | 101912 |
| 7 | 855017 |
| 8 | 6971744 |
| 9 | 56056227 |
| 10 | 460027479 |
| 11 | 3744369997 |
| 12 | 30459919249 |
| 13 | 248461764341 |
| 14 | 2023970288125 |
| 15 | 16487763568205 |
| 16 | 134364578393651 |
| 17 | 1094738595047762 |
| 18 | 8919632329662053 |
| 19 | 72678409286259667 |
| 20 | 592172715005066166 |
[0,61,130,1767,13314,101912,855017,6971744, 56056227,460027479,3744369997,30459919249, 248461764341,2023970288125,16487763568205, 134364578393651,1094738595047762,8919632329662053, 72678409286259667,592172715005066166] |