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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 5 |
| 3 | 315 |
| 4 | 2670 |
| 5 | 10810 |
| 6 | 30475 |
| 7 | 69405 |
| 8 | 137340 |
| 9 | 246020 |
| 10 | 409185 |
| 11 | 642575 |
| 12 | 963930 |
| 13 | 1392990 |
| 14 | 1951495 |
| 15 | 2663185 |
| 16 | 3553800 |
| 17 | 4651080 |
| 18 | 5984765 |
| 19 | 7586595 |
| 20 | 9490310 |
| 21 | 11731650 |
| 22 | 14348355 |
| 23 | 17380165 |
| 24 | 20868820 |
| 25 | 24858060 |
| 26 | 29393625 |
| 27 | 34523255 |
| 28 | 40296690 |
| 29 | 46765670 |
| 30 | 53983935 |
| 31 | 62007225 |
[0,5,315,2670,10810,30475,69405,137340,246020, 409185,642575,963930,1392990,1951495,2663185, 3553800,4651080,5984765,7586595,9490310,11731650, 14348355,17380165,20868820,24858060,29393625, 34523255,40296690,46765670,53983935,62007225] |