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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 14 |
| 3 | 107 |
| 4 | 1106 |
| 5 | 13173 |
| 6 | 168820 |
| 7 | 2264298 |
| 8 | 31356818 |
| 9 | 444803666 |
| 10 | 6429510234 |
| 11 | 94356870748 |
| 12 | 1402149248128 |
| 13 | 21055387206719 |
| 14 | 319007902203196 |
| 15 | 4870481885025752 |
| 16 | 74858763620576738 |
| 17 | 1157339247553310574 |
| 18 | 17985974981514604660 |
| 19 | 280813589679135551721 |
[1,3,14,107,1106,13173,168820,2264298,31356818, 444803666,6429510234,94356870748,1402149248128, 21055387206719,319007902203196,4870481885025752, 74858763620576738,1157339247553310574, 17985974981514604660,280813589679135551721] |