n | a(n) |
---|---|
5 | 1 |
6 | 5 |
7 | 20 |
8 | 76 |
9 | 285 |
10 | 1068 |
11 | 4015 |
12 | 15159 |
13 | 57486 |
14 | 218895 |
15 | 836604 |
16 | 3208036 |
17 | 12337630 |
18 | 47572239 |
19 | 183856635 |
20 | 712033264 |
21 | 2762629983 |
22 | 10736569602 |
23 | 41788665040 |
24 | 162869776650 |
25 | 635562468075 |
26 | 2482933033659 |
27 | 9710010151831 |
28 | 38008957336974 |
29 | 148912655255315 |
30 | 583885852950802 |
[1,5,20,76,285,1068,4015,15159,57486,218895, 836604,3208036,12337630,47572239,183856635, 712033264,2762629983,10736569602,41788665040, 162869776650,635562468075,2482933033659, 9710010151831,38008957336974,148912655255315, 583885852950802] |