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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 16 |
| 7 | 30 |
| 8 | 56 |
| 9 | 102 |
| 10 | 186 |
| 11 | 336 |
| 12 | 606 |
| 13 | 1088 |
| 14 | 1954 |
| 15 | 3502 |
| 16 | 6278 |
| 17 | 11246 |
| 18 | 20148 |
| 19 | 36086 |
| 20 | 64640 |
| 21 | 115774 |
| 22 | 207374 |
| 23 | 371430 |
| 24 | 665298 |
| 25 | 1191646 |
| 26 | 2134454 |
| 27 | 3823160 |
| 28 | 6847974 |
| 29 | 12265912 |
| 30 | 21970470 |
| 31 | 39353006 |
| 32 | 70488334 |
| 33 | 126257182 |
| 34 | 226149314 |
[0,1,2,4,8,16,30,56,102,186,336,606,1088,1954, 3502,6278,11246,20148,36086,64640,115774,207374, 371430,665298,1191646,2134454,3823160,6847974, 12265912,21970470,39353006,70488334,126257182, 226149314] |