n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 7 |
5 | 25 |
6 | 90 |
7 | 350 |
8 | 1701 |
9 | 7770 |
10 | 42525 |
11 | 246730 |
12 | 1379400 |
13 | 9321312 |
14 | 63436373 |
15 | 420693273 |
16 | 3281882604 |
17 | 25708104786 |
18 | 197462483400 |
19 | 1709751003480 |
20 | 15170932662679 |
21 | 132511015347084 |
22 | 1241963303533920 |
23 | 12320068811796900 |
24 | 120622574326072500 |
25 | 1203163392175387500 |
[1,1,3,7,25,90,350,1701,7770,42525,246730,1379400, 9321312,63436373,420693273,3281882604,25708104786, 197462483400,1709751003480,15170932662679, 132511015347084,1241963303533920, 12320068811796900,120622574326072500, 1203163392175387500] |