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| n | a(n) |
|---|---|
| 1 | 18400 |
| 2 | 41816 |
| 3 | 31296 |
| 4 | 46464 |
| 5 | 151704 |
| 6 | 309144 |
| 7 | 506656 |
| 8 | 1847872 |
| 9 | 4274816 |
| 10 | 7487600 |
| 11 | 26505656 |
| 12 | 67284984 |
| 13 | 123248320 |
| 14 | 462330456 |
| 15 | 1240757144 |
| 16 | 2319782976 |
| 17 | 8747007608 |
| 18 | 24156027576 |
| 19 | 45628433856 |
| 20 | 175122465816 |
| 21 | 489988794200 |
| 22 | 928931023680 |
[18400,41816,31296,46464,151704,309144,506656, 1847872,4274816,7487600,26505656,67284984, 123248320,462330456,1240757144,2319782976, 8747007608,24156027576,45628433856,175122465816, 489988794200,928931023680] |