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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 66 |
| 5 | 73 |
| 6 | 942 |
| 7 | 1015 |
| 8 | 10077 |
| 9 | 21169 |
| 10 | 52415 |
| 11 | 73584 |
| 12 | 2995775 |
| 13 | 3069359 |
| 14 | 9134493 |
| 15 | 21338345 |
| 16 | 201179598 |
| 17 | 222517943 |
| 18 | 2871394914 |
| 19 | 3093912857 |
| 20 | 30716610627 |
| 21 | 64527134111 |
| 22 | 159770878849 |
| 23 | 224298012960 |
| 24 | 9131691397249 |
| 25 | 9355989410209 |
| 26 | 27843670217667 |
| 27 | 65043329845543 |
[1,1,3,7,66,73,942,1015,10077,21169,52415,73584, 2995775,3069359,9134493,21338345,201179598, 222517943,2871394914,3093912857,30716610627, 64527134111,159770878849,224298012960, 9131691397249,9355989410209,27843670217667, 65043329845543] |