n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 0 |
5 | 0 |
6 | 0 |
7 | 1 |
8 | 4 |
9 | 10 |
10 | 20 |
11 | 36 |
12 | 68 |
13 | 166 |
14 | 540 |
15 | 1961 |
16 | 7012 |
17 | 23878 |
18 | 78004 |
19 | 250311 |
20 | 815196 |
21 | 2787806 |
22 | 10232556 |
23 | 40266382 |
24 | 166608080 |
25 | 708407020 |
26 | 3046352440 |
27 | 13161936881 |
28 | 57188405288 |
29 | 251328286460 |
30 | 1125890398160 |
31 | 5177570523461 |
32 | 24539362719532 |
33 | 119861818560962 |
34 | 601299401594540 |
35 | 3082695751138656 |
36 | 16075855888601716 |
37 | 85005009812011810 |
38 | 455172001509369028 |
39 | 2468935975119176601 |
40 | 13584735197391443020 |
[0,0,0,1,0,0,0,1,4,10,20,36,68,166,540,1961,7012, 23878,78004,250311,815196,2787806,10232556, 40266382,166608080,708407020,3046352440, 13161936881,57188405288,251328286460, 1125890398160,5177570523461,24539362719532, 119861818560962,601299401594540,3082695751138656, 16075855888601716,85005009812011810, 455172001509369028,2468935975119176601, 13584735197391443020] |