| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 2 |
| 7 | 2 |
| 8 | 4 |
| 9 | 8 |
| 10 | 14 |
| 11 | 26 |
| 12 | 52 |
| 13 | 97 |
| 14 | 193 |
| 15 | 377 |
| 16 | 752 |
| 17 | 1500 |
| 18 | 3022 |
| 19 | 6107 |
| 20 | 12429 |
| 21 | 25365 |
| 22 | 52042 |
| 23 | 107090 |
| 24 | 221235 |
| 25 | 458316 |
| 26 | 952439 |
| 27 | 1984262 |
| 28 | 4144601 |
| 29 | 8676232 |
| 30 | 18202536 |
| 31 | 38263456 |
| 32 | 80585694 |
| 33 | 170013976 |
| 34 | 359277183 |
| 35 | 760400787 |
| 36 | 1611721413 |
| 37 | 3420839200 |
| 38 | 7270098883 |
[0,0,0,1,0,2,2,4,8,14,26,52,97,193,377,752,1500, 3022,6107,12429,25365,52042,107090,221235,458316, 952439,1984262,4144601,8676232,18202536,38263456, 80585694,170013976,359277183,760400787,1611721413, 3420839200,7270098883] |