n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 36 |
3 | 400 |
4 | 4900 |
5 | 63504 |
6 | 853776 |
7 | 11778624 |
8 | 165636900 |
9 | 2363904400 |
10 | 34134779536 |
11 | 497634306624 |
12 | 7312459672336 |
13 | 108172480360000 |
14 | 1609341595560000 |
15 | 24061445010950400 |
16 | 361297635242552100 |
17 | 5445717990022688400 |
18 | 82358080713306090000 |
19 | 1249287673091590440000 |
[1,4,36,400,4900,63504,853776,11778624,165636900, 2363904400,34134779536,497634306624,7312459672336, 108172480360000,1609341595560000, 24061445010950400,361297635242552100, 5445717990022688400,82358080713306090000, 1249287673091590440000] |