n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 18 |
5 | 70 |
6 | 315 |
7 | 1281 |
8 | 5124 |
9 | 19692 |
10 | 73845 |
11 | 270655 |
12 | 974358 |
13 | 3454386 |
14 | 12090351 |
15 | 41851005 |
16 | 143489160 |
17 | 487862872 |
18 | 1646537193 |
19 | 5520742011 |
20 | 18402473370 |
21 | 61018727070 |
22 | 201361799331 |
23 | 661617340153 |
24 | 2165293113228 |
25 | 7060738412100 |
26 | 22947399839325 |
27 | 74349575478711 |
28 | 240206320777374 |
29 | 773998144726282 |
[0,0,1,3,18,70,315,1281,5124,19692,73845,270655, 974358,3454386,12090351,41851005,143489160, 487862872,1646537193,5520742011,18402473370, 61018727070,201361799331,661617340153, 2165293113228,7060738412100,22947399839325, 74349575478711,240206320777374,773998144726282] |