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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 15 |
| 6 | 25 |
| 7 | 49 |
| 8 | 79 |
| 9 | 129 |
| 10 | 211 |
| 11 | 341 |
| 12 | 517 |
| 13 | 819 |
| 14 | 1275 |
| 15 | 1863 |
| 16 | 2959 |
| 17 | 4335 |
| 18 | 6703 |
| 19 | 9709 |
| 20 | 15067 |
| 21 | 21367 |
| 22 | 33419 |
| 23 | 47081 |
| 24 | 72949 |
| 25 | 102315 |
| 26 | 158887 |
| 27 | 220881 |
| 28 | 342615 |
| 29 | 475107 |
| 30 | 734815 |
| 31 | 1015777 |
| 32 | 1569679 |
| 33 | 2161943 |
| 34 | 3337951 |
| 35 | 4587199 |
| 36 | 7069747 |
| 37 | 9699291 |
| 38 | 14932443 |
| 39 | 20445519 |
| 40 | 31441339 |
[0,1,3,7,15,25,49,79,129,211,341,517,819,1275, 1863,2959,4335,6703,9709,15067,21367,33419,47081, 72949,102315,158887,220881,342615,475107,734815, 1015777,1569679,2161943,3337951,4587199,7069747, 9699291,14932443,20445519,31441339] |