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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 32 |
| 5 | 348 |
| 6 | 4520 |
| 7 | 76840 |
| 8 | 1459949 |
| 9 | 33578823 |
| 10 | 973785863 |
| 11 | 30187361738 |
| 12 | 1116932384273 |
| 13 | 45794227755181 |
| 14 | 1969151793472765 |
| 15 | 92550134293219955 |
| 16 | 4905157117540657588 |
| 17 | 289404269934898797687 |
| 18 | 17653660466028826658882 |
| 19 | 1182795251223931386145053 |
| 20 | 83978462836899128416298742 |
[1,1,5,32,348,4520,76840,1459949,33578823, 973785863,30187361738,1116932384273, 45794227755181,1969151793472765,92550134293219955, 4905157117540657588,289404269934898797687, 17653660466028826658882,1182795251223931386145053, 83978462836899128416298742] |