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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 20 |
| 3 | 30 |
| 4 | 42 |
| 5 | 56 |
| 6 | 650 |
| 7 | 812 |
| 8 | 992 |
| 9 | 16256 |
| 10 | 67100672 |
| 11 | 17179738112 |
| 12 | 274877382656 |
| 13 | 1125625079263232 |
| 14 | 4611686016279904256 |
[12,20,30,42,56,650,812,992,16256,67100672, 17179738112,274877382656,1125625079263232, 4611686016279904256] |