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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 29 |
| 4 | 175 |
| 5 | 1078 |
| 6 | 6733 |
| 7 | 42484 |
| 8 | 270181 |
| 9 | 1729001 |
| 10 | 11120890 |
| 11 | 71830564 |
| 12 | 465602019 |
| 13 | 3027122255 |
| 14 | 19732154132 |
| 15 | 128914835233 |
| 16 | 843909485871 |
| 17 | 5534195177790 |
| 18 | 36349275489589 |
| 19 | 239083452412294 |
| 20 | 1574547632931610 |
| 21 | 10381569854732616 |
| 22 | 68521442772351716 |
| 23 | 452696586611302025 |
[1,1,5,29,175,1078,6733,42484,270181,1729001, 11120890,71830564,465602019,3027122255, 19732154132,128914835233,843909485871, 5534195177790,36349275489589,239083452412294, 1574547632931610,10381569854732616, 68521442772351716,452696586611302025] |