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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 12 |
| 3 | 14 |
| 4 | 1041 |
| 5 | 7320 |
| 6 | 123644 |
| 7 | 1271018 |
| 8 | 17049353 |
| 9 | 196353922 |
| 10 | 2459348722 |
| 11 | 29384305780 |
| 12 | 360468322267 |
| 13 | 4356949776930 |
| 14 | 53099711422957 |
| 15 | 644154946941384 |
| 16 | 7834538105922852 |
| 17 | 95149701105775632 |
| 18 | 1156519086175555400 |
[0,12,14,1041,7320,123644,1271018,17049353, 196353922,2459348722,29384305780,360468322267, 4356949776930,53099711422957,644154946941384, 7834538105922852,95149701105775632, 1156519086175555400] |