n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 2 |
5 | 5 |
6 | 12 |
7 | 30 |
8 | 76 |
9 | 196 |
10 | 512 |
11 | 1353 |
12 | 3610 |
13 | 9713 |
14 | 26324 |
15 | 71799 |
16 | 196938 |
17 | 542895 |
18 | 1503312 |
19 | 4179603 |
20 | 11662902 |
21 | 32652735 |
22 | 91695540 |
23 | 258215664 |
24 | 728997192 |
25 | 2062967382 |
26 | 5850674704 |
27 | 16626415975 |
28 | 47337954326 |
[1,0,0,1,2,5,12,30,76,196,512,1353,3610,9713, 26324,71799,196938,542895,1503312,4179603, 11662902,32652735,91695540,258215664,728997192, 2062967382,5850674704,16626415975,47337954326] |