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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 60 |
| 4 | 270 |
| 5 | 420 |
| 6 | 630 |
| 7 | 2970 |
| 8 | 5460 |
| 9 | 8190 |
| 10 | 36720 |
| 11 | 136500 |
| 12 | 172900 |
| 13 | 204750 |
| 14 | 245700 |
| 15 | 491400 |
| 16 | 790398 |
| 17 | 791700 |
| 18 | 819000 |
| 19 | 1037400 |
| 20 | 1138320 |
| 21 | 1187550 |
| 22 | 1228500 |
| 23 | 1801800 |
| 24 | 2457000 |
| 25 | 3767400 |
| 26 | 4176900 |
| 27 | 4504500 |
| 28 | 5405400 |
| 29 | 6397300 |
| 30 | 6688500 |
| 31 | 6741630 |
| 32 | 7698600 |
| 33 | 8353800 |
| 34 | 10032750 |
| 35 | 10228680 |
[1,6,60,270,420,630,2970,5460,8190,36720,136500, 172900,204750,245700,491400,790398,791700,819000, 1037400,1138320,1187550,1228500,1801800,2457000, 3767400,4176900,4504500,5405400,6397300,6688500, 6741630,7698600,8353800,10032750,10228680] |