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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 3 |
| 3 | 2 |
| 4 | 9 |
| 5 | 12 |
| 6 | 31 |
| 7 | 54 |
| 8 | 117 |
| 9 | 224 |
| 10 | 459 |
| 11 | 906 |
| 12 | 1825 |
| 13 | 3636 |
| 14 | 7287 |
| 15 | 14558 |
| 16 | 29133 |
| 17 | 58248 |
| 18 | 116515 |
| 19 | 233010 |
| 20 | 466041 |
| 21 | 932060 |
| 22 | 1864143 |
| 23 | 3728262 |
| 24 | 7456549 |
| 25 | 14913072 |
| 26 | 29826171 |
| 27 | 59652314 |
| 28 | 119304657 |
| 29 | 238609284 |
| 30 | 477218599 |
| 31 | 954437166 |
| 32 | 1908874365 |
[1,0,3,2,9,12,31,54,117,224,459,906,1825,3636, 7287,14558,29133,58248,116515,233010,466041, 932060,1864143,3728262,7456549,14913072,29826171, 59652314,119304657,238609284,477218599,954437166, 1908874365] |