n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 15 |
4 | 105 |
5 | 420 |
6 | 1260 |
7 | 3150 |
8 | 6930 |
9 | 13860 |
10 | 25740 |
11 | 45045 |
12 | 75075 |
13 | 120120 |
14 | 185640 |
15 | 278460 |
16 | 406980 |
17 | 581400 |
18 | 813960 |
19 | 1119195 |
20 | 1514205 |
21 | 2018940 |
22 | 2656500 |
23 | 3453450 |
24 | 4440150 |
25 | 5651100 |
26 | 7125300 |
27 | 8906625 |
28 | 11044215 |
29 | 13592880 |
30 | 16613520 |
31 | 20173560 |
32 | 24347400 |
33 | 29216880 |
[0,0,15,105,420,1260,3150,6930,13860,25740,45045, 75075,120120,185640,278460,406980,581400,813960, 1119195,1514205,2018940,2656500,3453450,4440150, 5651100,7125300,8906625,11044215,13592880, 16613520,20173560,24347400,29216880] |