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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 630 |
| 3 | 10670 |
| 4 | 163691 |
| 5 | 2363901 |
| 6 | 32800480 |
| 7 | 442568140 |
| 8 | 5850370581 |
| 9 | 76144382171 |
| 10 | 979096198730 |
| 11 | 12468275928810 |
| 12 | 157530257684671 |
| 13 | 1977386553510841 |
| 14 | 24685911967987380 |
| 15 | 306761026472700680 |
[1,31,630,10670,163691,2363901,32800480,442568140, 5850370581,76144382171,979096198730, 12468275928810,157530257684671,1977386553510841, 24685911967987380,306761026472700680] |