n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 5 |
4 | 18 |
5 | 68 |
6 | 235 |
7 | 801 |
8 | 2678 |
9 | 8777 |
10 | 28343 |
11 | 90455 |
12 | 285812 |
13 | 895302 |
14 | 2783602 |
15 | 8598096 |
16 | 26404831 |
17 | 80671908 |
18 | 245328807 |
19 | 742945582 |
20 | 2241375512 |
21 | 6738536925 |
22 | 20194613731 |
23 | 60344058090 |
24 | 179828931783 |
25 | 534560389757 |
26 | 1585341579329 |
27 | 4691443265544 |
[1,0,5,18,68,235,801,2678,8777,28343,90455,285812, 895302,2783602,8598096,26404831,80671908, 245328807,742945582,2241375512,6738536925, 20194613731,60344058090,179828931783,534560389757, 1585341579329,4691443265544] |