n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 15 |
5 | 40 |
6 | 104 |
7 | 273 |
8 | 714 |
9 | 1870 |
10 | 4895 |
11 | 12816 |
12 | 33552 |
13 | 87841 |
14 | 229970 |
15 | 602070 |
16 | 1576239 |
17 | 4126648 |
18 | 10803704 |
19 | 28284465 |
20 | 74049690 |
21 | 193864606 |
22 | 507544127 |
23 | 1328767776 |
24 | 3478759200 |
25 | 9107509825 |
26 | 23843770274 |
27 | 62423800998 |
28 | 163427632719 |
[0,1,2,6,15,40,104,273,714,1870,4895,12816,33552, 87841,229970,602070,1576239,4126648,10803704, 28284465,74049690,193864606,507544127,1328767776, 3478759200,9107509825,23843770274,62423800998, 163427632719] |