n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 20 |
3 | 75 |
4 | 288 |
5 | 1105 |
6 | 4234 |
7 | 16226 |
8 | 62188 |
9 | 238340 |
10 | 913452 |
11 | 3500857 |
12 | 13417236 |
13 | 51422337 |
14 | 197079099 |
15 | 755317101 |
16 | 2894796675 |
17 | 11094476468 |
18 | 42520225774 |
19 | 162961236161 |
20 | 624558407329 |
21 | 2393656389397 |
22 | 9173827208656 |
23 | 35159225871899 |
24 | 134749776270503 |
25 | 516436347919005 |
26 | 1979272313718089 |
[1,5,20,75,288,1105,4234,16226,62188,238340, 913452,3500857,13417236,51422337,197079099, 755317101,2894796675,11094476468,42520225774, 162961236161,624558407329,2393656389397, 9173827208656,35159225871899,134749776270503, 516436347919005,1979272313718089] |