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| n | a(n) |
|---|---|
| 1 | 357600 |
| 2 | 605904 |
| 3 | 1188294 |
| 4 | 2292662 |
| 5 | 4268548 |
| 6 | 8889408 |
| 7 | 18461564 |
| 8 | 38504536 |
| 9 | 81927058 |
| 10 | 175124024 |
| 11 | 382949392 |
| 12 | 840384096 |
| 13 | 1854763390 |
| 14 | 4145247490 |
| 15 | 9298939358 |
| 16 | 21035251042 |
| 17 | 47859954190 |
| 18 | 109376397754 |
| 19 | 251699350766 |
| 20 | 581573274808 |
[357600,605904,1188294,2292662,4268548,8889408, 18461564,38504536,81927058,175124024,382949392, 840384096,1854763390,4145247490,9298939358, 21035251042,47859954190,109376397754,251699350766, 581573274808] |