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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 13 |
| 3 | 127 |
| 4 | 1105 |
| 5 | 1255 |
| 6 | 24337 |
| 7 | 263671 |
| 8 | 725953 |
| 9 | 42823 |
| 10 | 40610545 |
| 11 | 163341463 |
| 12 | 780593185 |
| 13 | 5464152295 |
| 14 | 51309760081 |
| 15 | 45711664183 |
| 16 | 2200721587585 |
| 17 | 12583941205639 |
| 18 | 3454291215793 |
| 19 | 430419865184215 |
| 20 | 3012939056289505 |
| 21 | 10122098073837607 |
| 22 | 92791637157241105 |
| 23 | 517919756258420599 |
[0,1,13,127,1105,1255,24337,263671,725953,42823, 40610545,163341463,780593185,5464152295, 51309760081,45711664183,2200721587585, 12583941205639,3454291215793,430419865184215, 3012939056289505,10122098073837607, 92791637157241105,517919756258420599] |