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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 1 |
| 2 | 31 |
| 3 | 28 |
| 4 | 365 |
| 5 | 514 |
| 6 | 4388 |
| 7 | 8220 |
| 8 | 53871 |
| 9 | 122284 |
| 10 | 673222 |
| 11 | 1748055 |
| 12 | 8535397 |
| 13 | 24383499 |
| 14 | 109449848 |
| 15 | 334783855 |
| 16 | 1415768769 |
| 17 | 4548229589 |
| 18 | 18434398665 |
| 19 | 61345927764 |
| 20 | 241210652738 |
| 21 | 823296868656 |
| 22 | 3167642169823 |
| 23 | 11010462627756 |
| 24 | 41708741708554 |
| 25 | 146886286090602 |
[3,1,31,28,365,514,4388,8220,53871,122284,673222, 1748055,8535397,24383499,109449848,334783855, 1415768769,4548229589,18434398665,61345927764, 241210652738,823296868656,3167642169823, 11010462627756,41708741708554,146886286090602] |