n | a(n) |
---|---|
2 | 1 |
3 | 2 |
4 | 7 |
5 | 28 |
6 | 120 |
7 | 528 |
8 | 2344 |
9 | 10416 |
10 | 46160 |
11 | 203680 |
12 | 894312 |
13 | 3907056 |
14 | 16986352 |
15 | 73512288 |
16 | 316786960 |
17 | 1359763168 |
18 | 5815457184 |
19 | 24788842304 |
20 | 105340982248 |
21 | 446389242480 |
22 | 1886695382192 |
23 | 7955156287456 |
24 | 33468262290096 |
25 | 140516110684832 |
26 | 588832418973280 |
27 | 2463133441338048 |
[1,2,7,28,120,528,2344,10416,46160,203680,894312, 3907056,16986352,73512288,316786960,1359763168, 5815457184,24788842304,105340982248,446389242480, 1886695382192,7955156287456,33468262290096, 140516110684832,588832418973280,2463133441338048] |