n | a(n) |
---|---|
2 | 1 |
3 | 3 |
4 | 9 |
5 | 25 |
6 | 69 |
7 | 189 |
8 | 518 |
9 | 1422 |
10 | 3915 |
11 | 10813 |
12 | 29964 |
13 | 83304 |
14 | 232323 |
15 | 649845 |
16 | 1822824 |
17 | 5126520 |
18 | 14453451 |
19 | 40843521 |
20 | 115668105 |
21 | 328233969 |
22 | 933206967 |
23 | 2657946907 |
24 | 7583013474 |
25 | 21668135850 |
26 | 62007732605 |
27 | 177696228411 |
28 | 509899901553 |
29 | 1464990733969 |
30 | 4214045993925 |
[1,3,9,25,69,189,518,1422,3915,10813,29964,83304, 232323,649845,1822824,5126520,14453451,40843521, 115668105,328233969,933206967,2657946907, 7583013474,21668135850,62007732605,177696228411, 509899901553,1464990733969,4214045993925] |