| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 11 |
| 3 | 39 |
| 4 | 114 |
| 5 | 300 |
| 6 | 741 |
| 7 | 1757 |
| 8 | 4052 |
| 9 | 9162 |
| 10 | 20415 |
| 11 | 44979 |
| 12 | 98214 |
| 13 | 212888 |
| 14 | 458633 |
| 15 | 982905 |
| 16 | 2097000 |
| 17 | 4456278 |
| 18 | 9436995 |
| 19 | 19922735 |
| 20 | 41942810 |
| 21 | 88080132 |
| 22 | 184549101 |
| 23 | 385875669 |
| 24 | 805306044 |
| 25 | 1677721250 |
| 26 | 3489660551 |
| 27 | 7247756907 |
| 28 | 15032385102 |
| 29 | 31138512432 |
| 30 | 64424508945 |
[0,2,11,39,114,300,741,1757,4052,9162,20415,44979, 98214,212888,458633,982905,2097000,4456278, 9436995,19922735,41942810,88080132,184549101, 385875669,805306044,1677721250,3489660551, 7247756907,15032385102,31138512432,64424508945] |