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| n | a(n) |
|---|---|
| 1 | 1680 |
| 2 | 13676 |
| 3 | 108404 |
| 4 | 896112 |
| 5 | 7165920 |
| 6 | 59991972 |
| 7 | 483370700 |
| 8 | 4098064360 |
| 9 | 33256428216 |
| 10 | 285401797556 |
| 11 | 2331380041352 |
| 12 | 20236520658020 |
| 13 | 166277888470420 |
| 14 | 1458328058867824 |
| 15 | 12043248971236632 |
| 16 | 106601640805896728 |
[1680,13676,108404,896112,7165920,59991972, 483370700,4098064360,33256428216,285401797556, 2331380041352,20236520658020,166277888470420, 1458328058867824,12043248971236632, 106601640805896728] |