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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 19 |
| 3 | 123 |
| 4 | 283 |
| 5 | 1883 |
| 6 | 5083 |
| 7 | 30939 |
| 8 | 72411 |
| 9 | 483035 |
| 10 | 1296091 |
| 11 | 7919323 |
| 12 | 18544347 |
| 13 | 123614939 |
| 14 | 331790043 |
| 15 | 2027402971 |
| 16 | 4747015899 |
| 17 | 31645349595 |
| 18 | 84938700507 |
| 19 | 519012464347 |
| 20 | 1215235471067 |
| 21 | 8101213091547 |
| 22 | 21744285759195 |
| 23 | 132867186079451 |
| 24 | 311100309354203 |
[1,7,19,123,283,1883,5083,30939,72411,483035, 1296091,7919323,18544347,123614939,331790043, 2027402971,4747015899,31645349595,84938700507, 519012464347,1215235471067,8101213091547, 21744285759195,132867186079451,311100309354203] |