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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 31 |
| 4 | 235 |
| 5 | 2033 |
| 6 | 19220 |
| 7 | 193438 |
| 8 | 2038804 |
| 9 | 22261830 |
| 10 | 249955221 |
| 11 | 2870522839 |
| 12 | 33584727090 |
| 13 | 399117777590 |
| 14 | 4806462433605 |
| 15 | 58548059001309 |
| 16 | 720303118997053 |
| 17 | 8939341693860181 |
| 18 | 111801073862508091 |
| 19 | 1407896478406885631 |
| 20 | 17839002674912554079 |
| 21 | 227290810261647023091 |
| 22 | 2910570007328778112935 |
[1,1,5,31,235,2033,19220,193438,2038804,22261830, 249955221,2870522839,33584727090,399117777590, 4806462433605,58548059001309,720303118997053, 8939341693860181,111801073862508091, 1407896478406885631,17839002674912554079, 227290810261647023091,2910570007328778112935] |