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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 49 |
| 5 | 281 |
| 6 | 1975 |
| 7 | 15933 |
| 8 | 147457 |
| 9 | 1528282 |
| 10 | 17603351 |
| 11 | 222691261 |
| 12 | 3072168481 |
| 13 | 45882929925 |
| 14 | 737717712439 |
| 15 | 12703639993306 |
| 16 | 233281370579713 |
| 17 | 4550465650811445 |
| 18 | 93966210612477271 |
| 19 | 2047838398486924977 |
[1,1,3,10,49,281,1975,15933,147457,1528282, 17603351,222691261,3072168481,45882929925, 737717712439,12703639993306,233281370579713, 4550465650811445,93966210612477271, 2047838398486924977] |