n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 21 |
4 | 140 |
5 | 575 |
6 | 1785 |
7 | 4606 |
8 | 10416 |
9 | 21330 |
10 | 40425 |
11 | 71995 |
12 | 121836 |
13 | 197561 |
14 | 308945 |
15 | 468300 |
16 | 690880 |
17 | 995316 |
18 | 1404081 |
19 | 1943985 |
20 | 2646700 |
21 | 3549315 |
22 | 4694921 |
23 | 6133226 |
24 | 7921200 |
25 | 10123750 |
26 | 12814425 |
27 | 16076151 |
28 | 20001996 |
[0,1,21,140,575,1785,4606,10416,21330,40425,71995, 121836,197561,308945,468300,690880,995316,1404081, 1943985,2646700,3549315,4694921,6133226,7921200, 10123750,12814425,16076151,20001996] |