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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 81 |
| 5 | 244 |
| 6 | 793 |
| 7 | 2316 |
| 8 | 65536 |
| 9 | 262145 |
| 10 | 1049600 |
| 11 | 4196353 |
| 12 | 17308657 |
| 13 | 68703188 |
| 14 | 273234809 |
| 15 | 1088123500 |
| 16 | 152587890625 |
| 17 | 762939453126 |
| 18 | 3814697527769 |
| 19 | 19073486852414 |
| 20 | 95370918425026 |
| 21 | 476847618556329 |
| 22 | 2384217176269538 |
| 23 | 11921023106645561 |
| 24 | 59886119752101281 |
[1,4,9,81,244,793,2316,65536,262145,1049600, 4196353,17308657,68703188,273234809,1088123500, 152587890625,762939453126,3814697527769, 19073486852414,95370918425026,476847618556329, 2384217176269538,11921023106645561, 59886119752101281] |