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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 51 |
| 4 | 814 |
| 5 | 27562 |
| 6 | 1881132 |
| 7 | 252352192 |
| 8 | 66437453648 |
| 9 | 34544598832464 |
| 10 | 35670629662833824 |
| 11 | 73386908116413720320 |
| 12 | 301341520134976454507520 |
| 13 | 2471940307185604520086223360 |
| 14 | 40530105576773294054842498631680 |
| 15 | 1328619037998490196005266772240585728 |
| 16 | 87091009170221273841091095272951672891392 |
[1,2,7,51,814,27562,1881132,252352192,66437453648, 34544598832464,35670629662833824, 73386908116413720320,301341520134976454507520, 2471940307185604520086223360, 40530105576773294054842498631680, 1328619037998490196005266772240585728, 87091009170221273841091095272951672891392] |