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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 68 |
| 4 | 173 |
| 5 | 593 |
| 6 | 1748 |
| 7 | 908 |
| 8 | 40178 |
| 9 | 74093 |
| 10 | 91538 |
| 11 | 93308 |
| 12 | 441803 |
| 13 | 10712063 |
| 14 | 7898483 |
| 15 | 35865968 |
| 16 | 133019963 |
| 17 | 206951093 |
| 18 | 1314259253 |
| 19 | 2453647853 |
| 20 | 6701493818 |
| 21 | 54776939873 |
| 22 | 7717930358 |
| 23 | 250589717363 |
| 24 | 255937042268 |
| 25 | 3665861003153 |
| 26 | 957987212453 |
| 27 | 9953155219223 |
[1,2,8,68,173,593,1748,908,40178,74093,91538, 93308,441803,10712063,7898483,35865968,133019963, 206951093,1314259253,2453647853,6701493818, 54776939873,7717930358,250589717363,255937042268, 3665861003153,957987212453,9953155219223] |