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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 18 |
| 4 | 440 |
| 5 | 32404 |
| 6 | 7423456 |
| 7 | 5473328160 |
| 8 | 13430706072192 |
| 9 | 113086387825668384 |
| 10 | 3345639802029563258880 |
| 11 | 353900830082830194441001984 |
| 12 | 135600928084762756427776332541952 |
| 13 | 190092581374833963606044859875698932736 |
| 14 | 982736440685354936080688846774429648871161856 |
[1,2,18,440,32404,7423456,5473328160, 13430706072192,113086387825668384, 3345639802029563258880, 353900830082830194441001984, 135600928084762756427776332541952, 190092581374833963606044859875698932736, 982736440685354936080688846774429648871161856] |