| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 7 |
| 7 | 14 |
| 8 | 36 |
| 9 | 85 |
| 10 | 226 |
| 11 | 577 |
| 12 | 1561 |
| 13 | 4158 |
| 14 | 11413 |
| 15 | 31200 |
| 16 | 86722 |
| 17 | 241227 |
| 18 | 677729 |
| 19 | 1908832 |
| 20 | 5411431 |
| 21 | 15386107 |
| 22 | 43949347 |
| 23 | 125896209 |
| 24 | 361904137 |
| 25 | 1043032250 |
| 26 | 3014490719 |
| 27 | 8732211825 |
| 28 | 25353395331 |
| 29 | 73759912892 |
| 30 | 215007439768 |
| 31 | 627844428958 |
| 32 | 1836466543942 |
[1,1,2,3,7,14,36,85,226,577,1561,4158,11413,31200, 86722,241227,677729,1908832,5411431,15386107, 43949347,125896209,361904137,1043032250, 3014490719,8732211825,25353395331,73759912892, 215007439768,627844428958,1836466543942] |