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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 3 |
| 4 | 19 |
| 5 | 107 |
| 6 | 691 |
| 7 | 4929 |
| 8 | 39958 |
| 9 | 361114 |
| 10 | 3617842 |
| 11 | 39839167 |
| 12 | 478446607 |
| 13 | 6222389995 |
| 14 | 87141729459 |
| 15 | 1307336091119 |
| 16 | 20919193567746 |
| 17 | 355645495960717 |
| 18 | 6401893756352511 |
| 19 | 121639082125097830 |
| 20 | 2432829344591803920 |
| 21 | 51089970941577272512 |
| 22 | 1123986359392616081280 |
| 23 | 25851788572429206208046 |
| 24 | 620444847283311945960411 |
| 25 | 15511151016762411683607733 |
| 26 | 403290394935411695227886859 |
| 27 | 10888849001142056697750434215 |
| 28 | 304887920401982037154914970647 |
| 29 | 8841752695810641318540928982492 |
| 30 | 265252660423388422894156833658591 |
[0,0,3,19,107,691,4929,39958,361114,3617842, 39839167,478446607,6222389995,87141729459, 1307336091119,20919193567746,355645495960717, 6401893756352511,121639082125097830, 2432829344591803920,51089970941577272512, 1123986359392616081280,25851788572429206208046, 620444847283311945960411, 15511151016762411683607733, 403290394935411695227886859, 10888849001142056697750434215, 304887920401982037154914970647, 8841752695810641318540928982492, 265252660423388422894156833658591] |