n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 14 |
4 | 54 |
5 | 220 |
6 | 934 |
7 | 4090 |
8 | 18344 |
9 | 83850 |
10 | 389214 |
11 | 1829736 |
12 | 8693962 |
13 | 41685714 |
14 | 201442188 |
15 | 980091814 |
16 | 4797070022 |
17 | 23603701828 |
18 | 116688837886 |
19 | 579312087802 |
20 | 2887020896016 |
21 | 14437318756818 |
22 | 72424982972862 |
23 | 364366674463824 |
24 | 1837954750285458 |
[1,1,4,14,54,220,934,4090,18344,83850,389214, 1829736,8693962,41685714,201442188,980091814, 4797070022,23603701828,116688837886,579312087802, 2887020896016,14437318756818,72424982972862, 364366674463824,1837954750285458] |