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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 101 |
| 4 | 1639 |
| 5 | 30665 |
| 6 | 630225 |
| 7 | 13836981 |
| 8 | 319062453 |
| 9 | 7640441894 |
| 10 | 188534274850 |
| 11 | 4767113222750 |
| 12 | 122998902095908 |
| 13 | 3228067183537455 |
| 14 | 85960229675478804 |
| 15 | 2317956019913480326 |
| 16 | 63193008693741620771 |
| 17 | 1739473925024629613227 |
| 18 | 48292271242981605779173 |
[1,1,8,101,1639,30665,630225,13836981,319062453, 7640441894,188534274850,4767113222750, 122998902095908,3228067183537455, 85960229675478804,2317956019913480326, 63193008693741620771,1739473925024629613227, 48292271242981605779173] |