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| n | a(n) |
|---|---|
| 1 | 56312 |
| 2 | 199340 |
| 3 | 705072 |
| 4 | 2505400 |
| 5 | 8928348 |
| 6 | 31925284 |
| 7 | 114484712 |
| 8 | 411823840 |
| 9 | 1485448976 |
| 10 | 5373690488 |
| 11 | 19489761268 |
| 12 | 70882202404 |
| 13 | 258422403744 |
| 14 | 944616682504 |
| 15 | 3460926725184 |
| 16 | 12711697164416 |
| 17 | 46792887212012 |
| 18 | 172654340693828 |
[56312,199340,705072,2505400,8928348,31925284, 114484712,411823840,1485448976,5373690488, 19489761268,70882202404,258422403744,944616682504, 3460926725184,12711697164416,46792887212012, 172654340693828] |