n | a(n) |
---|---|
0 | 3 |
1 | 20 |
2 | 105 |
3 | 504 |
4 | 2310 |
5 | 10296 |
6 | 45045 |
7 | 194480 |
8 | 831402 |
9 | 3527160 |
10 | 14872858 |
11 | 62403600 |
12 | 260757900 |
13 | 1085822640 |
14 | 4508102925 |
15 | 18668849760 |
16 | 77138650050 |
17 | 318107374200 |
18 | 1309542023790 |
19 | 5382578744400 |
20 | 22093039119060 |
21 | 90567738003600 |
22 | 370847442355650 |
23 | 1516927277253024 |
[3,20,105,504,2310,10296,45045,194480,831402, 3527160,14872858,62403600,260757900,1085822640, 4508102925,18668849760,77138650050,318107374200, 1309542023790,5382578744400,22093039119060, 90567738003600,370847442355650,1516927277253024] |