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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 198 |
| 3 | 608 |
| 4 | 4680 |
| 5 | 11322 |
| 6 | 20826 |
| 7 | 56608 |
| 8 | 60192 |
| 9 | 179424 |
| 10 | 1737000 |
| 11 | 2578968 |
| 12 | 3055150 |
| 13 | 3441888 |
| 14 | 5604192 |
| 15 | 6008184 |
| 16 | 6331104 |
| 17 | 302459850 |
| 18 | 320457888 |
| 19 | 477229032 |
| 20 | 565344850 |
| 21 | 579667086 |
| 22 | 589459104 |
| 23 | 731925000 |
| 24 | 766073448 |
| 25 | 907521650 |
| 26 | 928765600 |
| 27 | 3586977576 |
| 28 | 3732082848 |
| 29 | 6487717600 |
[1,198,608,4680,11322,20826,56608,60192,179424, 1737000,2578968,3055150,3441888,5604192,6008184, 6331104,302459850,320457888,477229032,565344850, 579667086,589459104,731925000,766073448,907521650, 928765600,3586977576,3732082848,6487717600] |