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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 16 |
| 3 | 95 |
| 4 | 590 |
| 5 | 3755 |
| 6 | 24266 |
| 7 | 158448 |
| 8 | 1042346 |
| 9 | 6895491 |
| 10 | 45814172 |
| 11 | 305442703 |
| 12 | 2042080348 |
| 13 | 13684126812 |
| 14 | 91875463080 |
| 15 | 617863215368 |
| 16 | 4160959900522 |
| 17 | 28055667406147 |
| 18 | 189367714620976 |
| 19 | 1279362095322717 |
| 20 | 8650402250562118 |
| 21 | 58532189534911523 |
| 22 | 396310088499317090 |
[1,3,16,95,590,3755,24266,158448,1042346,6895491, 45814172,305442703,2042080348,13684126812, 91875463080,617863215368,4160959900522, 28055667406147,189367714620976,1279362095322717, 8650402250562118,58532189534911523, 396310088499317090] |