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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 21 |
| 2 | 693 |
| 3 | 23940 |
| 4 | 734643 |
| 5 | 13697019 |
| 6 | -494620749 |
| 7 | -83079255420 |
| 8 | -6814815765975 |
| 9 | -444980496382695 |
| 10 | -25071954462140859 |
| 11 | -1226361084729855984 |
| 12 | -49426887403935395172 |
| 13 | -1287188243957889124740 |
| 14 | 23935850133162849385308 |
| 15 | 6798920856226697943604944 |
| 16 | 650950202721260061404073891 |
[1,21,693,23940,734643,13697019,-494620749, -83079255420,-6814815765975,-444980496382695, -25071954462140859,-1226361084729855984, -49426887403935395172,-1287188243957889124740, 23935850133162849385308,6798920856226697943604944, 650950202721260061404073891] |