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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 6 |
| 5 | 226 |
| 6 | 1072 |
| 7 | 255088 |
| 8 | 4638576 |
| 9 | 6663430912 |
| 10 | 467260456608 |
| 11 | 3916162476483538 |
| 12 | 1076226888605605706 |
| 13 | 51249820944023435573470 |
| 14 | 56126499620491437281263608 |
| 15 | 14870957102232406137455708164254 |
| 16 | 65882516522625836326159786165530572 |
| 17 | 95494789899510664733921727510895952184006 |
[0,1,5,6,226,1072,255088,4638576,6663430912, 467260456608,3916162476483538,1076226888605605706, 51249820944023435573470, 56126499620491437281263608, 14870957102232406137455708164254, 65882516522625836326159786165530572, 95494789899510664733921727510895952184006] |