n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 7 |
3 | 31 |
4 | 115 |
5 | 390 |
6 | 1254 |
7 | 3893 |
8 | 11789 |
9 | 35045 |
10 | 102695 |
11 | 297516 |
12 | 853932 |
13 | 2432041 |
14 | 6881395 |
15 | 19361995 |
16 | 54214939 |
17 | 151164018 |
18 | 419910354 |
19 | 1162585565 |
20 | 3209268665 |
21 | 8835468881 |
22 | 24266461007 |
23 | 66501634776 |
24 | 181882282200 |
25 | 496539007825 |
26 | 1353272290399 |
27 | 3682496714743 |
[0,1,7,31,115,390,1254,3893,11789,35045,102695, 297516,853932,2432041,6881395,19361995,54214939, 151164018,419910354,1162585565,3209268665, 8835468881,24266461007,66501634776,181882282200, 496539007825,1353272290399,3682496714743] |