n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 20 |
3 | 75 |
4 | 279 |
5 | 1040 |
6 | 3881 |
7 | 14485 |
8 | 54060 |
9 | 201755 |
10 | 752959 |
11 | 2810080 |
12 | 10487361 |
13 | 39139365 |
14 | 146070100 |
15 | 545141035 |
16 | 2034494039 |
17 | 7592835120 |
18 | 28336846441 |
19 | 105754550645 |
20 | 394681356140 |
21 | 1472970873915 |
22 | 5497202139519 |
23 | 20515837684160 |
24 | 76566148597121 |
25 | 285748756704325 |
[1,5,20,75,279,1040,3881,14485,54060,201755, 752959,2810080,10487361,39139365,146070100, 545141035,2034494039,7592835120,28336846441, 105754550645,394681356140,1472970873915, 5497202139519,20515837684160,76566148597121, 285748756704325] |