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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 154 |
| 5 | 3455 |
| 6 | 120196 |
| 7 | 5995892 |
| 8 | 406005804 |
| 9 | 35839643175 |
| 10 | 3998289746065 |
| 11 | 550054365477936 |
| 12 | 91478394767427823 |
| 13 | 18091315306315315610 |
| 14 | 4196205472500769304318 |
| 15 | 1128136777063831105273242 |
| 16 | 347994813261017613045578964 |
| 17 | 122080313159891715442898099217 |
[1,1,2,12,154,3455,120196,5995892,406005804, 35839643175,3998289746065,550054365477936, 91478394767427823,18091315306315315610, 4196205472500769304318,1128136777063831105273242, 347994813261017613045578964, 122080313159891715442898099217] |