n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 17 |
6 | 56 |
7 | 179 |
8 | 607 |
9 | 2076 |
10 | 7269 |
11 | 25736 |
12 | 92360 |
13 | 334506 |
14 | 1222463 |
15 | 4499892 |
16 | 16673446 |
17 | 62130710 |
18 | 232700539 |
19 | 875483029 |
20 | 3307244256 |
21 | 12539455600 |
22 | 47702381244 |
23 | 182021195608 |
24 | 696487788847 |
25 | 2671877845634 |
26 | 10274126646175 |
27 | 39593295985708 |
28 | 152889766657797 |
[1,0,1,2,6,17,56,179,607,2076,7269,25736,92360, 334506,1222463,4499892,16673446,62130710, 232700539,875483029,3307244256,12539455600, 47702381244,182021195608,696487788847, 2671877845634,10274126646175,39593295985708, 152889766657797] |