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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 4 |
| 6 | 7 |
| 7 | 10 |
| 8 | 23 |
| 9 | 46 |
| 10 | 79 |
| 11 | 157 |
| 12 | 315 |
| 13 | 588 |
| 14 | 1137 |
| 15 | 2249 |
| 16 | 4337 |
| 17 | 8402 |
| 18 | 16495 |
| 19 | 32179 |
| 20 | 62707 |
| 21 | 122916 |
| 22 | 240837 |
| 23 | 471456 |
| 24 | 925061 |
| 25 | 1816610 |
| 26 | 3566865 |
| 27 | 7010347 |
| 28 | 13789477 |
| 29 | 27130956 |
| 30 | 53409503 |
| 31 | 105205514 |
| 32 | 207309743 |
| 33 | 408672454 |
| 34 | 805989367 |
| 35 | 1590166915 |
| 36 | 3138371715 |
[0,0,1,1,1,4,7,10,23,46,79,157,315,588,1137,2249, 4337,8402,16495,32179,62707,122916,240837,471456, 925061,1816610,3566865,7010347,13789477,27130956, 53409503,105205514,207309743,408672454,805989367, 1590166915,3138371715] |