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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 30 |
| 3 | 5850 |
| 4 | 1157730 |
| 5 | 229221540 |
| 6 | 45384688830 |
| 7 | 8985939059790 |
| 8 | 1779170548525890 |
| 9 | 352266782665431240 |
| 10 | 69747043797185672190 |
| 11 | 13809562405059974172930 |
| 12 | 2734223609158076980818690 |
| 13 | 541362465050894178032921580 |
| 14 | 107187033856467889149087366750 |
| 15 | 21222491341115591157198758976630 |
[0,30,5850,1157730,229221540,45384688830, 8985939059790,1779170548525890,352266782665431240, 69747043797185672190,13809562405059974172930, 2734223609158076980818690, 541362465050894178032921580, 107187033856467889149087366750, 21222491341115591157198758976630] |