n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 12 |
4 | 48 |
5 | 168 |
6 | 734 |
7 | 2901 |
8 | 12956 |
9 | 53952 |
10 | 247794 |
11 | 1076150 |
12 | 5002284 |
13 | 22265521 |
14 | 104854868 |
15 | 476333956 |
16 | 2259433082 |
17 | 10406933888 |
18 | 49727145013 |
19 | 231743193049 |
20 | 1112557697545 |
21 | 5229835292503 |
22 | 25223740295131 |
23 | 119457136172201 |
24 | 578033615443152 |
25 | 2753450989395258 |
26 | 13365420050944659 |
27 | 63989848689178980 |
[1,1,4,12,48,168,734,2901,12956,53952,247794, 1076150,5002284,22265521,104854868,476333956, 2259433082,10406933888,49727145013,231743193049, 1112557697545,5229835292503,25223740295131, 119457136172201,578033615443152,2753450989395258, 13365420050944659,63989848689178980] |