n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 2 |
4 | 4 |
5 | 12 |
6 | 28 |
7 | 68 |
8 | 156 |
9 | 356 |
10 | 796 |
11 | 1764 |
12 | 3868 |
13 | 8420 |
14 | 18204 |
15 | 39140 |
16 | 83740 |
17 | 178404 |
18 | 378652 |
19 | 800996 |
20 | 1689372 |
21 | 3553508 |
22 | 7456540 |
23 | 15612132 |
24 | 32622364 |
25 | 68040932 |
26 | 141674268 |
27 | 294533348 |
28 | 611436316 |
29 | 1267611876 |
30 | 2624702236 |
31 | 5428361444 |
32 | 11214636828 |
[0,0,0,2,4,12,28,68,156,356,796,1764,3868,8420, 18204,39140,83740,178404,378652,800996,1689372, 3553508,7456540,15612132,32622364,68040932, 141674268,294533348,611436316,1267611876, 2624702236,5428361444,11214636828] |