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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 11 |
| 4 | 68 |
| 5 | 629 |
| 6 | 7791 |
| 7 | 117655 |
| 8 | 2097224 |
| 9 | 43046745 |
| 10 | 1000000637 |
| 11 | 25937424611 |
| 12 | 743008378618 |
| 13 | 23298085122493 |
| 14 | 793714773371811 |
| 15 | 29192926025391919 |
| 16 | 1152921504608944272 |
| 17 | 48661191875666868497 |
| 18 | 2185911559738739594277 |
| 19 | 104127350297911241532859 |
[1,3,11,68,629,7791,117655,2097224,43046745, 1000000637,25937424611,743008378618, 23298085122493,793714773371811,29192926025391919, 1152921504608944272,48661191875666868497, 2185911559738739594277,104127350297911241532859] |