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| n | a(n) |
|---|---|
| 0 | 7 |
| 1 | 43 |
| 2 | 264 |
| 3 | 1620 |
| 4 | 9940 |
| 5 | 60989 |
| 6 | 374211 |
| 7 | 2296051 |
| 8 | 14087908 |
| 9 | 86439348 |
| 10 | 530366956 |
| 11 | 3254178965 |
| 12 | 19966705347 |
| 13 | 122509956183 |
| 14 | 751685824132 |
| 15 | 4612127828672 |
| 16 | 28298688661016 |
| 17 | 173632607265289 |
| 18 | 1065359694467895 |
| 19 | 6536740399587511 |
| 20 | 40107557356899000 |
| 21 | 246088426157852600 |
| 22 | 1509927741297161799 |
[7,43,264,1620,9940,60989,374211,2296051,14087908, 86439348,530366956,3254178965,19966705347, 122509956183,751685824132,4612127828672, 28298688661016,173632607265289,1065359694467895, 6536740399587511,40107557356899000, 246088426157852600,1509927741297161799] |