n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 2 |
6 | 4 |
7 | 6 |
8 | 15 |
9 | 31 |
10 | 67 |
11 | 155 |
12 | 343 |
13 | 787 |
14 | 1829 |
15 | 4233 |
16 | 9940 |
17 | 23454 |
18 | 55540 |
19 | 132390 |
20 | 316704 |
21 | 760462 |
22 | 1833050 |
23 | 4431552 |
24 | 10745282 |
25 | 26125316 |
26 | 63672044 |
27 | 155536070 |
28 | 380739734 |
29 | 933832952 |
30 | 2294581836 |
31 | 5647750518 |
32 | 13923153431 |
33 | 34375447863 |
34 | 84989987987 |
35 | 210407135915 |
36 | 521547749731 |
37 | 1294310608775 |
38 | 3215632551785 |
39 | 7997467696213 |
40 | 19910095233857 |
[0,0,0,0,0,2,4,6,15,31,67,155,343,787,1829,4233, 9940,23454,55540,132390,316704,760462,1833050, 4431552,10745282,26125316,63672044,155536070, 380739734,933832952,2294581836,5647750518, 13923153431,34375447863,84989987987,210407135915, 521547749731,1294310608775,3215632551785, 7997467696213,19910095233857] |