n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 9 |
4 | 42 |
5 | 140 |
6 | 383 |
7 | 925 |
8 | 2056 |
9 | 4316 |
10 | 8705 |
11 | 17069 |
12 | 32810 |
13 | 62192 |
14 | 116743 |
15 | 217673 |
16 | 404000 |
17 | 747496 |
18 | 1380177 |
19 | 2544865 |
20 | 4688186 |
21 | 8631620 |
22 | 15886111 |
23 | 29230725 |
24 | 53776968 |
25 | 98926372 |
26 | 181971057 |
27 | 334716197 |
28 | 615660634 |
29 | 1132400520 |
[0,0,1,9,42,140,383,925,2056,4316,8705,17069, 32810,62192,116743,217673,404000,747496,1380177, 2544865,4688186,8631620,15886111,29230725, 53776968,98926372,181971057,334716197,615660634, 1132400520] |