n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 3 |
4 | 21 |
5 | 75 |
6 | 195 |
7 | 420 |
8 | 798 |
9 | 1386 |
10 | 2250 |
11 | 3465 |
12 | 5115 |
13 | 7293 |
14 | 10101 |
15 | 13650 |
16 | 18060 |
17 | 23460 |
18 | 29988 |
19 | 37791 |
20 | 47025 |
21 | 57855 |
22 | 70455 |
23 | 85008 |
24 | 101706 |
25 | 120750 |
26 | 142350 |
27 | 166725 |
28 | 194103 |
29 | 224721 |
30 | 258825 |
31 | 296670 |
32 | 338520 |
33 | 384648 |
34 | 435336 |
35 | 490875 |
36 | 551565 |
37 | 617715 |
38 | 689643 |
[0,0,3,21,75,195,420,798,1386,2250,3465,5115,7293, 10101,13650,18060,23460,29988,37791,47025,57855, 70455,85008,101706,120750,142350,166725,194103, 224721,258825,296670,338520,384648,435336,490875, 551565,617715,689643] |