n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 23 |
3 | 73 |
4 | 211 |
5 | 581 |
6 | 1560 |
7 | 4135 |
8 | 10890 |
9 | 28590 |
10 | 74946 |
11 | 196326 |
12 | 514123 |
13 | 1346148 |
14 | 3524441 |
15 | 9227311 |
16 | 24157645 |
17 | 63245795 |
18 | 165579930 |
19 | 433494205 |
20 | 1134902916 |
21 | 2971214796 |
22 | 7778741748 |
23 | 20365010748 |
24 | 53316290821 |
25 | 139583862066 |
26 | 365435295755 |
27 | 956722025605 |
28 | 2504730781495 |
[1,6,23,73,211,581,1560,4135,10890,28590,74946, 196326,514123,1346148,3524441,9227311,24157645, 63245795,165579930,433494205,1134902916, 2971214796,7778741748,20365010748,53316290821, 139583862066,365435295755,956722025605, 2504730781495] |