n | a(n) |
---|---|
0 | 2 |
1 | 4 |
2 | 9 |
3 | 23 |
4 | 55 |
5 | 126 |
6 | 291 |
7 | 678 |
8 | 1578 |
9 | 3667 |
10 | 8523 |
11 | 19815 |
12 | 46066 |
13 | 107089 |
14 | 248950 |
15 | 578740 |
16 | 1345409 |
17 | 3127695 |
18 | 7271007 |
19 | 16903042 |
20 | 39294807 |
21 | 91349342 |
22 | 212361454 |
23 | 493680487 |
24 | 1147667895 |
25 | 2668004163 |
26 | 6202357186 |
27 | 14418731129 |
28 | 33519483178 |
[2,4,9,23,55,126,291,678,1578,3667,8523,19815, 46066,107089,248950,578740,1345409,3127695, 7271007,16903042,39294807,91349342,212361454, 493680487,1147667895,2668004163,6202357186, 14418731129,33519483178] |