n | a(n) |
---|---|
0 | 3 |
1 | 13 |
2 | 57 |
3 | 251 |
4 | 1107 |
5 | 4885 |
6 | 21561 |
7 | 95171 |
8 | 420099 |
9 | 1854397 |
10 | 8185689 |
11 | 36133355 |
12 | 159500307 |
13 | 704068357 |
14 | 3107907993 |
15 | 13718969459 |
16 | 60558460803 |
17 | 267317978605 |
18 | 1179998646009 |
19 | 5208766025819 |
20 | 22992605632851 |
21 | 101494271616373 |
[3,13,57,251,1107,4885,21561,95171,420099,1854397, 8185689,36133355,159500307,704068357,3107907993, 13718969459,60558460803,267317978605, 1179998646009,5208766025819,22992605632851, 101494271616373] |