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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 29 |
| 6 | 58 |
| 7 | 125 |
| 8 | 254 |
| 9 | 471 |
| 10 | 939 |
| 11 | 2005 |
| 12 | 4074 |
| 13 | 7541 |
| 14 | 15018 |
| 15 | 32085 |
| 16 | 65194 |
| 17 | 120661 |
| 18 | 240298 |
| 19 | 513365 |
| 20 | 1043114 |
| 21 | 1930581 |
| 22 | 3844778 |
| 23 | 8213845 |
| 24 | 16689834 |
| 25 | 30889301 |
| 26 | 61516458 |
| 27 | 131421525 |
| 28 | 267037354 |
| 29 | 494228821 |
| 30 | 984263338 |
| 31 | 2102744405 |
| 32 | 4272597674 |
| 33 | 7907661141 |
[1,0,3,7,15,29,58,125,254,471,939,2005,4074,7541, 15018,32085,65194,120661,240298,513365,1043114, 1930581,3844778,8213845,16689834,30889301, 61516458,131421525,267037354,494228821,984263338, 2102744405,4272597674,7907661141] |