n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 10 |
5 | 24 |
6 | 50 |
7 | 121 |
8 | 260 |
9 | 637 |
10 | 1400 |
11 | 3468 |
12 | 7752 |
13 | 19380 |
14 | 43890 |
15 | 110561 |
16 | 253000 |
17 | 641355 |
18 | 1480050 |
19 | 3771885 |
20 | 8765250 |
21 | 22439040 |
22 | 52451256 |
23 | 134796060 |
24 | 316663760 |
25 | 816540124 |
26 | 1926501200 |
27 | 4982228488 |
28 | 11798983280 |
29 | 30593078076 |
30 | 72690164850 |
[0,1,2,5,10,24,50,121,260,637,1400,3468,7752, 19380,43890,110561,253000,641355,1480050,3771885, 8765250,22439040,52451256,134796060,316663760, 816540124,1926501200,4982228488,11798983280, 30593078076,72690164850] |