n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 10 |
6 | 20 |
7 | 40 |
8 | 70 |
9 | 112 |
10 | 168 |
11 | 252 |
12 | 360 |
13 | 495 |
14 | 660 |
15 | 880 |
16 | 1144 |
17 | 1456 |
18 | 1820 |
19 | 2275 |
20 | 2800 |
21 | 3400 |
22 | 4080 |
23 | 4896 |
24 | 5814 |
25 | 6840 |
26 | 7980 |
27 | 9310 |
28 | 10780 |
29 | 12397 |
30 | 14168 |
31 | 16192 |
32 | 18400 |
33 | 20800 |
34 | 23400 |
35 | 26325 |
36 | 29484 |
37 | 32886 |
38 | 36540 |
39 | 40600 |
40 | 44950 |
[0,0,1,4,10,20,40,70,112,168,252,360,495,660,880, 1144,1456,1820,2275,2800,3400,4080,4896,5814,6840, 7980,9310,10780,12397,14168,16192,18400,20800, 23400,26325,29484,32886,36540,40600,44950] |