n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 5 |
6 | 15 |
7 | 21 |
8 | 56 |
9 | 84 |
10 | 210 |
11 | 330 |
12 | 792 |
13 | 1287 |
14 | 3003 |
15 | 5005 |
16 | 11440 |
17 | 19448 |
18 | 43758 |
19 | 75582 |
20 | 167960 |
21 | 293930 |
22 | 646646 |
23 | 1144066 |
24 | 2496144 |
25 | 4457400 |
26 | 9657700 |
27 | 17383860 |
28 | 37442160 |
29 | 67863915 |
30 | 145422675 |
31 | 265182525 |
32 | 565722720 |
33 | 1037158320 |
34 | 2203961430 |
35 | 4059928950 |
36 | 8597496600 |
37 | 15905368710 |
38 | 33578000610 |
39 | 62359143990 |
[0,0,1,1,4,5,15,21,56,84,210,330,792,1287,3003, 5005,11440,19448,43758,75582,167960,293930,646646, 1144066,2496144,4457400,9657700,17383860,37442160, 67863915,145422675,265182525,565722720,1037158320, 2203961430,4059928950,8597496600,15905368710, 33578000610,62359143990] |