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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 722 |
| 2 | 87362 |
| 3 | 4298066 |
| 4 | 116323586 |
| 5 | 2029779538 |
| 6 | 25216532290 |
| 7 | 238745924050 |
| 8 | 1810015572994 |
| 9 | 11406058224594 |
| 10 | 61497762026306 |
| 11 | 290259969857618 |
| 12 | 1221518092836098 |
| 13 | 4652599114237778 |
| 14 | 16237772840882498 |
| 15 | 52462123239704786 |
| 16 | 158268201857667074 |
| 17 | 449093392401112274 |
| 18 | 1206082191029270850 |
[1,722,87362,4298066,116323586,2029779538, 25216532290,238745924050,1810015572994, 11406058224594,61497762026306,290259969857618, 1221518092836098,4652599114237778, 16237772840882498,52462123239704786, 158268201857667074,449093392401112274, 1206082191029270850] |