n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 5 |
5 | 16 |
6 | 82 |
7 | 169 |
8 | 541 |
9 | 2272 |
10 | 17965 |
11 | 44407 |
12 | 201751 |
13 | 801515 |
14 | 4890886 |
15 | 52218595 |
16 | 165519640 |
17 | 835947970 |
18 | 4290442728 |
19 | 24096524166 |
20 | 179566203960 |
21 | 2739764737710 |
22 | 9938147178960 |
23 | 60997160143920 |
24 | 331360222255920 |
25 | 2154105076695000 |
[1,1,4,5,16,82,169,541,2272,17965,44407,201751, 801515,4890886,52218595,165519640,835947970, 4290442728,24096524166,179566203960,2739764737710, 9938147178960,60997160143920,331360222255920, 2154105076695000] |