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| n | a(n) |
|---|---|
| 1 | -1 |
| 2 | 0 |
| 3 | 4 |
| 4 | 94 |
| 5 | 284 |
| 6 | 9398 |
| 7 | 50692 |
| 8 | 2354158 |
| 9 | 75006408 |
| 10 | 445719928 |
| 11 | 53055577416 |
| 12 | 1055507209474 |
| 13 | 16217635288124 |
| 14 | 1663779309692618 |
| 15 | 115680647722172136 |
| 16 | 5515487010932110572 |
| 17 | 76943944440184239772 |
| 18 | 17660133817084175986164 |
| 19 | 686773689508904350332526 |
| 20 | 19312334585726976150166616 |
| 21 | 5276558856319725444255594528 |
| 22 | 245447734128317092747434820766 |
[-1,0,4,94,284,9398,50692,2354158,75006408, 445719928,53055577416,1055507209474, 16217635288124,1663779309692618, 115680647722172136,5515487010932110572, 76943944440184239772,17660133817084175986164, 686773689508904350332526, 19312334585726976150166616, 5276558856319725444255594528, 245447734128317092747434820766] |