n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 12 |
5 | 22 |
6 | 68 |
7 | 166 |
8 | 534 |
9 | 1589 |
10 | 5464 |
11 | 18579 |
12 | 68320 |
13 | 255424 |
14 | 1000852 |
15 | 4018156 |
16 | 16671976 |
17 | 70890940 |
18 | 309439942 |
19 | 1381815168 |
20 | 6310880471 |
21 | 29428287639 |
22 | 140012980007 |
23 | 678970863717 |
24 | 3353545264060 |
25 | 16857749613964 |
26 | 86191265140699 |
27 | 447951112379963 |
28 | 2365177154077186 |
[1,1,2,4,12,22,68,166,534,1589,5464,18579,68320, 255424,1000852,4018156,16671976,70890940, 309439942,1381815168,6310880471,29428287639, 140012980007,678970863717,3353545264060, 16857749613964,86191265140699,447951112379963, 2365177154077186] |