n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 7 |
3 | 18 |
4 | 49 |
5 | 136 |
6 | 377 |
7 | 1044 |
8 | 2891 |
9 | 8006 |
10 | 22171 |
11 | 61398 |
12 | 170029 |
13 | 470860 |
14 | 1303949 |
15 | 3611016 |
16 | 9999959 |
17 | 27692810 |
18 | 76689487 |
19 | 212375610 |
20 | 588130153 |
21 | 1628704336 |
22 | 4510358465 |
23 | 12490501212 |
24 | 34589849507 |
25 | 95789405774 |
26 | 265268869027 |
[1,2,7,18,49,136,377,1044,2891,8006,22171,61398, 170029,470860,1303949,3611016,9999959,27692810, 76689487,212375610,588130153,1628704336, 4510358465,12490501212,34589849507,95789405774, 265268869027] |