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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 67 |
| 2 | 3079 |
| 3 | 65458 |
| 4 | 436705 |
| 5 | 3325420 |
| 6 | 21257887 |
| 7 | 137628082 |
| 8 | 852017725 |
| 9 | 5260500568 |
| 10 | 32028617995 |
| 11 | 194422680046 |
| 12 | 1174383558985 |
| 13 | 7081178928436 |
| 14 | 42616157629303 |
| 15 | 256244634375850 |
| 16 | 1539564650731285 |
| 17 | 9246057306575824 |
| 18 | 55510175964258211 |
[0,67,3079,65458,436705,3325420,21257887, 137628082,852017725,5260500568,32028617995, 194422680046,1174383558985,7081178928436, 42616157629303,256244634375850,1539564650731285, 9246057306575824,55510175964258211] |