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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 7 |
| 7 | 18 |
| 8 | 29 |
| 9 | 63 |
| 10 | 116 |
| 11 | 229 |
| 12 | 445 |
| 13 | 856 |
| 14 | 1677 |
| 15 | 3229 |
| 16 | 6298 |
| 17 | 12185 |
| 18 | 23675 |
| 19 | 45922 |
| 20 | 89097 |
| 21 | 172931 |
| 22 | 335460 |
| 23 | 651065 |
| 24 | 1263145 |
| 25 | 2451184 |
| 26 | 4756105 |
| 27 | 9228777 |
| 28 | 17907538 |
| 29 | 34747357 |
| 30 | 67424063 |
| 31 | 130828370 |
| 32 | 253859365 |
| 33 | 492585879 |
| 34 | 955810772 |
| 35 | 1854647997 |
| 36 | 3598744709 |
[1,0,1,1,2,5,7,18,29,63,116,229,445,856,1677,3229, 6298,12185,23675,45922,89097,172931,335460,651065, 1263145,2451184,4756105,9228777,17907538,34747357, 67424063,130828370,253859365,492585879,955810772, 1854647997,3598744709] |