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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 930 |
| 3 | 27900 |
| 4 | 836535 |
| 5 | 25082100 |
| 6 | 752044965 |
| 7 | 22548807900 |
| 8 | 676088221260 |
| 9 | 20271372436125 |
| 10 | 607803134933490 |
| 11 | 18223958540698875 |
| 12 | 546414860017738110 |
| 13 | 16383333982098029400 |
| 14 | 491226816855341457015 |
| 15 | 14728612983261055500600 |
[1,31,930,27900,836535,25082100,752044965, 22548807900,676088221260,20271372436125, 607803134933490,18223958540698875, 546414860017738110,16383333982098029400, 491226816855341457015,14728612983261055500600] |