n | a(n) |
---|---|
-1 | 1 |
0 | 1 |
1 | 5 |
2 | 10 |
3 | 70 |
4 | 440 |
5 | 4280 |
6 | 44560 |
7 | 575920 |
8 | 8224640 |
9 | 134583680 |
10 | 2422639360 |
11 | 48232203520 |
12 | 1044455459840 |
13 | 24541639470080 |
14 | 620471213148160 |
15 | 16815502865029120 |
16 | 485975291876311040 |
17 | 14924807659888148480 |
18 | 485281269068774440960 |
19 | 16656262639515411742720 |
20 | 601766641496428795658240 |
[1,1,5,10,70,440,4280,44560,575920,8224640, 134583680,2422639360,48232203520,1044455459840, 24541639470080,620471213148160,16815502865029120, 485975291876311040,14924807659888148480, 485281269068774440960,16656262639515411742720, 601766641496428795658240] |