n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 12 |
5 | 37 |
6 | 130 |
7 | 428 |
8 | 1481 |
9 | 5091 |
10 | 17979 |
11 | 64176 |
12 | 234311 |
13 | 869645 |
14 | 3295100 |
15 | 12720494 |
16 | 50083996 |
17 | 200964437 |
18 | 821845766 |
19 | 3423694821 |
20 | 14524845181 |
21 | 62725701708 |
22 | 275629610199 |
23 | 1231863834775 |
24 | 5597240308384 |
25 | 25844969339979 |
26 | 121224757935416 |
27 | 577359833539428 |
28 | 2791096628891679 |
[1,0,1,3,12,37,130,428,1481,5091,17979,64176, 234311,869645,3295100,12720494,50083996,200964437, 821845766,3423694821,14524845181,62725701708, 275629610199,1231863834775,5597240308384, 25844969339979,121224757935416,577359833539428, 2791096628891679] |