n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 3 |
4 | 16 |
5 | 65 |
6 | 238 |
7 | 866 |
8 | 3128 |
9 | 11493 |
10 | 42660 |
11 | 160584 |
12 | 610640 |
13 | 2345504 |
14 | 9081768 |
15 | 35422175 |
16 | 139022622 |
17 | 548671517 |
18 | 2176051050 |
19 | 8668363573 |
20 | 34667284390 |
21 | 139140830956 |
22 | 560271494630 |
23 | 2262709876003 |
24 | 9163000968554 |
25 | 37198940600264 |
26 | 151364381618576 |
[0,0,3,16,65,238,866,3128,11493,42660,160584, 610640,2345504,9081768,35422175,139022622, 548671517,2176051050,8668363573,34667284390, 139140830956,560271494630,2262709876003, 9163000968554,37198940600264,151364381618576] |