n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 2 |
5 | 8 |
6 | 28 |
7 | 100 |
8 | 358 |
9 | 1309 |
10 | 4772 |
11 | 17556 |
12 | 64782 |
13 | 240090 |
14 | 892662 |
15 | 3329942 |
16 | 12456782 |
17 | 46725350 |
18 | 175698056 |
19 | 662193908 |
20 | 2501118956 |
21 | 9465771967 |
22 | 35891640172 |
23 | 136331485336 |
24 | 518702002350 |
25 | 1976588406300 |
26 | 7543137149256 |
27 | 28826327724850 |
28 | 110304963059048 |
[0,0,0,1,2,8,28,100,358,1309,4772,17556,64782, 240090,892662,3329942,12456782,46725350,175698056, 662193908,2501118956,9465771967,35891640172, 136331485336,518702002350,1976588406300, 7543137149256,28826327724850,110304963059048] |