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| n | a(n) |
|---|---|
| 15 | 37837800 |
| 16 | 100900800 |
| 17 | 588107520 |
| 18 | 2977294320 |
| 19 | 20020160160 |
| 20 | 164118754800 |
| 21 | 635661248040 |
| 22 | 3295178686800 |
| 23 | 17741374681800 |
| 24 | 95826446465904 |
| 25 | 623399389674600 |
| 26 | 2664090278249400 |
| 27 | 13876038856379700 |
| 28 | 71797074694745400 |
| 29 | 375274098870636420 |
| 30 | 2199911433079733100 |
[37837800,100900800,588107520,2977294320, 20020160160,164118754800,635661248040, 3295178686800,17741374681800,95826446465904, 623399389674600,2664090278249400, 13876038856379700,71797074694745400, 375274098870636420,2199911433079733100] |