n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 3 |
5 | 4 |
6 | 12 |
7 | 24 |
8 | 70 |
9 | 172 |
10 | 525 |
11 | 1530 |
12 | 5078 |
13 | 16994 |
14 | 61456 |
15 | 228898 |
16 | 895910 |
17 | 3617148 |
18 | 15130833 |
19 | 65084088 |
20 | 287828488 |
21 | 1304327221 |
22 | 6050218591 |
23 | 28675928883 |
24 | 138730847262 |
25 | 684300453848 |
26 | 3438439910436 |
27 | 17585597712632 |
28 | 91479580896616 |
29 | 483699938173293 |
30 | 2598090378779507 |
[1,0,0,1,3,4,12,24,70,172,525,1530,5078,16994, 61456,228898,895910,3617148,15130833,65084088, 287828488,1304327221,6050218591,28675928883, 138730847262,684300453848,3438439910436, 17585597712632,91479580896616,483699938173293, 2598090378779507] |