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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 72 |
| 4 | 114048 |
| 5 | 14515200000 |
| 6 | 234709539840000000 |
| 7 | 698712561855933972480000000 |
| 8 | 523145284340194421434020324704256000000 |
| 9 | 128974285815375032145715297526239008267285037056000000 |
| 10 | 13271794881195622862513637643190449698396346431150489600000000000000000 |
[1,1,2,72,114048,14515200000,234709539840000000, 698712561855933972480000000, 523145284340194421434020324704256000000, 12897428581537503214571529752623900826728503705600\ 0000, 13271794881195622862513637643190449698396346431150\ 489600000000000000000] |