n | a(n) |
---|---|
0 | 1 |
1 | 21 |
2 | 420 |
3 | 8380 |
4 | 167181 |
5 | 3335241 |
6 | 66537640 |
7 | 1327417560 |
8 | 26481813561 |
9 | 528308853661 |
10 | 10539695259660 |
11 | 210265596339540 |
12 | 4194772231531141 |
13 | 83685179034283281 |
14 | 1669508808454134480 |
15 | 33306490990048406320 |
[1,21,420,8380,167181,3335241,66537640,1327417560, 26481813561,528308853661,10539695259660, 210265596339540,4194772231531141, 83685179034283281,1669508808454134480, 33306490990048406320] |