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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 78 |
| 3 | 432 |
| 4 | 1560 |
| 5 | 4350 |
| 6 | 10206 |
| 7 | 21168 |
| 8 | 40032 |
| 9 | 70470 |
| 10 | 117150 |
| 11 | 185856 |
| 12 | 283608 |
| 13 | 418782 |
| 14 | 601230 |
| 15 | 842400 |
| 16 | 1155456 |
| 17 | 1555398 |
| 18 | 2059182 |
| 19 | 2685840 |
| 20 | 3456600 |
| 21 | 4395006 |
| 22 | 5527038 |
| 23 | 6881232 |
| 24 | 8488800 |
| 25 | 10383750 |
| 26 | 12603006 |
| 27 | 15186528 |
| 28 | 18177432 |
| 29 | 21622110 |
| 30 | 25570350 |
[6,78,432,1560,4350,10206,21168,40032,70470, 117150,185856,283608,418782,601230,842400,1155456, 1555398,2059182,2685840,3456600,4395006,5527038, 6881232,8488800,10383750,12603006,15186528, 18177432,21622110,25570350] |