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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 460 |
| 4 | 10480 |
| 5 | 262264 |
| 6 | 6968920 |
| 7 | 193069480 |
| 8 | 5515713624 |
| 9 | 161332352440 |
| 10 | 4807707617064 |
| 11 | 145452700810040 |
| 12 | 4455938243565144 |
| 13 | 137951634380458936 |
| 14 | 4309354120105494920 |
| 15 | 135662827893112703864 |
| 16 | 4299732712210509636536 |
| 17 | 137088360221810475982712 |
[1,2,24,460,10480,262264,6968920,193069480, 5515713624,161332352440,4807707617064, 145452700810040,4455938243565144, 137951634380458936,4309354120105494920, 135662827893112703864,4299732712210509636536, 137088360221810475982712] |