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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 75 |
| 3 | 186 |
| 4 | 531 |
| 5 | 627 |
| 6 | 5216 |
| 7 | 22843 |
| 8 | 148050 |
| 9 | 1061385 |
| 10 | 1490407 |
| 11 | 1562485 |
| 12 | 9034704 |
| 13 | 10422738 |
| 14 | 31920786 |
| 15 | 76343543 |
| 16 | 78824242 |
| 17 | 105791155 |
| 18 | 111873121 |
| 19 | 131515163 |
| 20 | 549038887 |
| 21 | 1318856915 |
| 22 | 1394579379 |
| 23 | 1630428366 |
| 24 | 1639063828 |
| 25 | 3710476544 |
| 26 | 3996221763 |
| 27 | 4524478925 |
| 28 | 6172721935 |
[4,75,186,531,627,5216,22843,148050,1061385, 1490407,1562485,9034704,10422738,31920786, 76343543,78824242,105791155,111873121,131515163, 549038887,1318856915,1394579379,1630428366, 1639063828,3710476544,3996221763,4524478925, 6172721935] |