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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 15 |
| 2 | 370 |
| 3 | 6150 |
| 4 | 86430 |
| 5 | 1114210 |
| 6 | 13641990 |
| 7 | 161419770 |
| 8 | 1864197550 |
| 9 | 21141975330 |
| 10 | 236419753110 |
| 11 | 2614197530890 |
| 12 | 28641975308670 |
| 13 | 311419753086450 |
| 14 | 3364197530864230 |
| 15 | 36141975308642010 |
| 16 | 386419753086419790 |
[0,15,370,6150,86430,1114210,13641990,161419770, 1864197550,21141975330,236419753110,2614197530890, 28641975308670,311419753086450,3364197530864230, 36141975308642010,386419753086419790] |