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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 35 |
| 3 | 496 |
| 4 | 9701 |
| 5 | 241956 |
| 6 | 7338631 |
| 7 | 262184896 |
| 8 | 10783446409 |
| 9 | 501827040100 |
| 10 | 26069206375211 |
| 11 | 1495427735314800 |
| 12 | 93885489910449901 |
| 13 | 6403169506981578436 |
| 14 | 471427031236487965199 |
| 15 | 37265225545829174607616 |
| 16 | 3147895910861898495432209 |
[1,4,35,496,9701,241956,7338631,262184896, 10783446409,501827040100,26069206375211, 1495427735314800,93885489910449901, 6403169506981578436,471427031236487965199, 37265225545829174607616,3147895910861898495432209] |