n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 8 |
4 | 39 |
5 | 138 |
6 | 414 |
7 | 1104 |
8 | 2715 |
9 | 6282 |
10 | 13875 |
11 | 29540 |
12 | 61060 |
13 | 123192 |
14 | 243589 |
15 | 473540 |
16 | 907335 |
17 | 1716974 |
18 | 3214066 |
19 | 5959704 |
20 | 10958687 |
21 | 20001526 |
22 | 36264579 |
23 | 65359752 |
24 | 117165096 |
25 | 209008464 |
26 | 371190217 |
27 | 656540768 |
28 | 1156924167 |
29 | 2031676818 |
30 | 3556517478 |
[0,0,1,8,39,138,414,1104,2715,6282,13875,29540, 61060,123192,243589,473540,907335,1716974,3214066, 5959704,10958687,20001526,36264579,65359752, 117165096,209008464,371190217,656540768, 1156924167,2031676818,3556517478] |