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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 46 |
| 3 | 1347 |
| 4 | 32220 |
| 5 | 686661 |
| 6 | 13579914 |
| 7 | 254863751 |
| 8 | 4601440184 |
| 9 | 80635542921 |
| 10 | 1379999420134 |
| 11 | 23167187812555 |
| 12 | 382770785757588 |
| 13 | 6239740764495309 |
| 14 | 100556187294037314 |
| 15 | 1604514927998181135 |
| 16 | 25381661274646261616 |
| 17 | 398462715169752739601 |
| 18 | 6213273419843077690782 |
[0,1,46,1347,32220,686661,13579914,254863751, 4601440184,80635542921,1379999420134, 23167187812555,382770785757588,6239740764495309, 100556187294037314,1604514927998181135, 25381661274646261616,398462715169752739601, 6213273419843077690782] |