n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 17 |
4 | 57 |
5 | 189 |
6 | 668 |
7 | 2344 |
8 | 8533 |
9 | 30974 |
10 | 114791 |
11 | 425083 |
12 | 1595222 |
13 | 5987456 |
14 | 22670866 |
15 | 85903427 |
16 | 327487069 |
17 | 1249648855 |
18 | 4789354971 |
19 | 18374473131 |
20 | 70722563222 |
21 | 272488738875 |
22 | 1052474921232 |
23 | 4069154654592 |
24 | 15762913929933 |
25 | 61118213094098 |
26 | 237343892291713 |
27 | 922479508068593 |
28 | 3589932929804338 |
[1,2,6,17,57,189,668,2344,8533,30974,114791, 425083,1595222,5987456,22670866,85903427, 327487069,1249648855,4789354971,18374473131, 70722563222,272488738875,1052474921232, 4069154654592,15762913929933,61118213094098, 237343892291713,922479508068593,3589932929804338] |