n | a(n) |
---|---|
0 | 1 |
1 | 9 |
2 | 39 |
3 | 120 |
4 | 315 |
5 | 753 |
6 | 1687 |
7 | 3612 |
8 | 7470 |
9 | 15040 |
10 | 29634 |
11 | 57366 |
12 | 109421 |
13 | 206115 |
14 | 384105 |
15 | 709152 |
16 | 1298613 |
17 | 2360943 |
18 | 4264835 |
19 | 7659870 |
20 | 13686456 |
21 | 24340184 |
22 | 43102644 |
23 | 76031100 |
24 | 133636825 |
25 | 234116493 |
26 | 408900987 |
[1,9,39,120,315,753,1687,3612,7470,15040,29634, 57366,109421,206115,384105,709152,1298613,2360943, 4264835,7659870,13686456,24340184,43102644, 76031100,133636825,234116493,408900987] |