n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 5 |
3 | 23 |
4 | 112 |
5 | 558 |
6 | 2790 |
7 | 13951 |
8 | 69755 |
9 | 348773 |
10 | 1743862 |
11 | 8719308 |
12 | 43596540 |
13 | 217982701 |
14 | 1089913505 |
15 | 5449567523 |
16 | 27247837612 |
17 | 136239188058 |
18 | 681195940290 |
19 | 3405979701451 |
20 | 17029898507255 |
21 | 85149492536273 |
[0,1,5,23,112,558,2790,13951,69755,348773,1743862, 8719308,43596540,217982701,1089913505,5449567523, 27247837612,136239188058,681195940290, 3405979701451,17029898507255,85149492536273] |