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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 22 |
| 4 | 301 |
| 5 | 6631 |
| 6 | 214681 |
| 7 | 9600088 |
| 8 | 566959457 |
| 9 | 42745927717 |
| 10 | 4006577981071 |
| 11 | 457002288429666 |
| 12 | 62332395019232053 |
| 13 | 10018273615964100787 |
| 14 | 1873929413170092413773 |
| 15 | 403602063302844878730196 |
| 16 | 99165966659478338987124481 |
| 17 | 27570715036265111940880945673 |
| 18 | 8611670013649050886554308425147 |
| 19 | 3002629280961610435928764405429774 |
| 20 | 1161987842547239267511188646916322781 |
[1,1,3,22,301,6631,214681,9600088,566959457, 42745927717,4006577981071,457002288429666, 62332395019232053,10018273615964100787, 1873929413170092413773,403602063302844878730196, 99165966659478338987124481, 27570715036265111940880945673, 8611670013649050886554308425147, 3002629280961610435928764405429774, 1161987842547239267511188646916322781] |