n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 20 |
3 | 75 |
4 | 240 |
5 | 726 |
6 | 2075 |
7 | 5620 |
8 | 14645 |
9 | 36875 |
10 | 90057 |
11 | 214065 |
12 | 497170 |
13 | 1129670 |
14 | 2517425 |
15 | 5512125 |
16 | 11871310 |
17 | 25184930 |
18 | 52686885 |
19 | 108786970 |
20 | 221894842 |
21 | 447455885 |
22 | 892609420 |
23 | 1762608545 |
24 | 3447282925 |
25 | 6680871925 |
26 | 12835968690 |
27 | 24459374345 |
28 | 46243132855 |
29 | 86773966825 |
30 | 161664667295 |
[1,5,20,75,240,726,2075,5620,14645,36875,90057, 214065,497170,1129670,2517425,5512125,11871310, 25184930,52686885,108786970,221894842,447455885, 892609420,1762608545,3447282925,6680871925, 12835968690,24459374345,46243132855,86773966825, 161664667295] |