n | a(n) |
---|---|
1 | 0 |
2 | 20 |
3 | 195 |
4 | 4420 |
5 | 72624 |
6 | 1347905 |
7 | 23877840 |
8 | 430583140 |
9 | 7712000835 |
10 | 138485573876 |
11 | 2484341814240 |
12 | 44584372180225 |
13 | 800002107309600 |
14 | 14355674602647860 |
15 | 257600625681170499 |
16 | 4622465972012379940 |
17 | 82946715695078486160 |
18 | 1488418904383171787585 |
19 | 26708590219470770907120 |
[0,20,195,4420,72624,1347905,23877840,430583140, 7712000835,138485573876,2484341814240, 44584372180225,800002107309600,14355674602647860, 257600625681170499,4622465972012379940, 82946715695078486160,1488418904383171787585, 26708590219470770907120] |