n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 4 |
3 | 2 |
4 | 18 |
5 | 18 |
6 | 86 |
7 | 122 |
8 | 430 |
9 | 746 |
10 | 2222 |
11 | 4346 |
12 | 11742 |
13 | 24682 |
14 | 62958 |
15 | 138202 |
16 | 340670 |
17 | 767562 |
18 | 1853838 |
19 | 4242746 |
20 | 10122974 |
21 | 23386282 |
22 | 55392686 |
23 | 128691866 |
24 | 303490046 |
25 | 707472138 |
26 | 1664048590 |
27 | 3886957050 |
28 | 9128207134 |
29 | 21347938154 |
[1,0,4,2,18,18,86,122,430,746,2222,4346,11742, 24682,62958,138202,340670,767562,1853838,4242746, 10122974,23386282,55392686,128691866,303490046, 707472138,1664048590,3886957050,9128207134, 21347938154] |