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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 49 |
| 3 | 336 |
| 4 | 2282 |
| 5 | 15358 |
| 6 | 102606 |
| 7 | 681254 |
| 8 | 4499278 |
| 9 | 29579382 |
| 10 | 193688894 |
| 11 | 1263866086 |
| 12 | 8221560942 |
| 13 | 53335049558 |
| 14 | 345145632286 |
| 15 | 2228595939654 |
| 16 | 14361269047118 |
| 17 | 92377858496182 |
| 18 | 593235919318014 |
| 19 | 3803941311320486 |
| 20 | 24358026991712302 |
[7,49,336,2282,15358,102606,681254,4499278, 29579382,193688894,1263866086,8221560942, 53335049558,345145632286,2228595939654, 14361269047118,92377858496182,593235919318014, 3803941311320486,24358026991712302] |