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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 32 |
| 3 | 255 |
| 4 | 2033 |
| 5 | 16208 |
| 6 | 129217 |
| 7 | 1030173 |
| 8 | 8212978 |
| 9 | 65477359 |
| 10 | 522013397 |
| 11 | 4161713160 |
| 12 | 33178950053 |
| 13 | 264516722873 |
| 14 | 2108839989442 |
| 15 | 16812570686523 |
| 16 | 134036975068993 |
| 17 | 1068599860225264 |
| 18 | 8519333271178937 |
| 19 | 67919753770243365 |
[4,32,255,2033,16208,129217,1030173,8212978, 65477359,522013397,4161713160,33178950053, 264516722873,2108839989442,16812570686523, 134036975068993,1068599860225264,8519333271178937, 67919753770243365] |