n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 1 |
4 | 1 |
5 | 2 |
6 | 7 |
7 | 12 |
8 | 41 |
9 | 86 |
10 | 247 |
11 | 585 |
12 | 1548 |
13 | 3849 |
14 | 9896 |
15 | 25001 |
16 | 63724 |
17 | 161721 |
18 | 411257 |
19 | 1044878 |
20 | 2655719 |
21 | 6748972 |
22 | 17151849 |
23 | 43589578 |
24 | 110777391 |
25 | 281529169 |
26 | 715471992 |
27 | 1818293377 |
28 | 4620978640 |
29 | 11743694657 |
30 | 29845241080 |
31 | 75848270001 |
[1,0,1,1,2,7,12,41,86,247,585,1548,3849,9896, 25001,63724,161721,411257,1044878,2655719,6748972, 17151849,43589578,110777391,281529169,715471992, 1818293377,4620978640,11743694657,29845241080, 75848270001] |