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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 36 |
| 2 | 1260 |
| 3 | 44100 |
| 4 | 1543500 |
| 5 | 54022500 |
| 6 | 1890786870 |
| 7 | 66177518400 |
| 8 | 2316212372880 |
| 9 | 81067406061600 |
| 10 | 2837358267534000 |
| 11 | 99307506301920000 |
| 12 | 3475761563405646270 |
| 13 | 121651614218556733500 |
| 14 | 4257805080127526578980 |
| 15 | 149023128191211379381500 |
[1,36,1260,44100,1543500,54022500,1890786870, 66177518400,2316212372880,81067406061600, 2837358267534000,99307506301920000, 3475761563405646270,121651614218556733500, 4257805080127526578980,149023128191211379381500] |