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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 29 |
| 5 | 183 |
| 6 | 1319 |
| 7 | 12122 |
| 8 | 124802 |
| 9 | 1508581 |
| 10 | 20150509 |
| 11 | 302637564 |
| 12 | 4960500764 |
| 13 | 89164162579 |
| 14 | 1730245993111 |
| 15 | 36241995276276 |
| 16 | 812108432244304 |
| 17 | 19430625834864633 |
| 18 | 493622198791114665 |
| 19 | 13283773364613034324 |
| 20 | 377224137563670860492 |
| 21 | 11278211794764786428831 |
[0,1,2,7,29,183,1319,12122,124802,1508581, 20150509,302637564,4960500764,89164162579, 1730245993111,36241995276276,812108432244304, 19430625834864633,493622198791114665, 13283773364613034324,377224137563670860492, 11278211794764786428831] |