n | a(n) |
---|---|
3 | 1 |
4 | 8 |
5 | 45 |
6 | 219 |
7 | 987 |
8 | 4248 |
9 | 17748 |
10 | 72675 |
11 | 293436 |
12 | 1172908 |
13 | 4653935 |
14 | 18366075 |
15 | 72186075 |
16 | 282861360 |
17 | 1105877880 |
18 | 4316224860 |
19 | 16825024134 |
20 | 65525448960 |
21 | 255024693434 |
22 | 992116674142 |
23 | 3858537980286 |
24 | 15004402265424 |
25 | 58343871881400 |
[1,8,45,219,987,4248,17748,72675,293436,1172908, 4653935,18366075,72186075,282861360,1105877880, 4316224860,16825024134,65525448960,255024693434, 992116674142,3858537980286,15004402265424, 58343871881400] |