n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 3 |
6 | 14 |
7 | 38 |
8 | 125 |
9 | 360 |
10 | 1107 |
11 | 3297 |
12 | 10292 |
13 | 32134 |
14 | 103759 |
15 | 340566 |
16 | 1148150 |
17 | 3951339 |
18 | 13925330 |
19 | 50122316 |
20 | 184365292 |
21 | 692145409 |
22 | 2651444318 |
23 | 10356184440 |
24 | 41224744182 |
25 | 167150406897 |
26 | 689998967755 |
27 | 2898493498253 |
28 | 12384852601731 |
29 | 53804601888559 |
30 | 237566072006014 |
[1,0,0,0,1,3,14,38,125,360,1107,3297,10292,32134, 103759,340566,1148150,3951339,13925330,50122316, 184365292,692145409,2651444318,10356184440, 41224744182,167150406897,689998967755, 2898493498253,12384852601731,53804601888559, 237566072006014] |