n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 140 |
3 | 4995 |
4 | 65824 |
5 | 489125 |
6 | 2521476 |
7 | 10092775 |
8 | 33562880 |
9 | 96870249 |
10 | 250025500 |
11 | 589527851 |
12 | 1290008160 |
13 | 2651218765 |
14 | 5165397524 |
15 | 9611031375 |
16 | 17180133376 |
17 | 29647326545 |
18 | 49590297900 |
19 | 80672546899 |
20 | 128000804000 |
21 | 198571037301 |
22 | 301818598180 |
23 | 450289780535 |
[0,1,140,4995,65824,489125,2521476,10092775, 33562880,96870249,250025500,589527851,1290008160, 2651218765,5165397524,9611031375,17180133376, 29647326545,49590297900,80672546899,128000804000, 198571037301,301818598180,450289780535] |