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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 9 |
| 6 | 18 |
| 7 | 30 |
| 8 | 53 |
| 9 | 85 |
| 10 | 139 |
| 11 | 215 |
| 12 | 336 |
| 13 | 504 |
| 14 | 760 |
| 15 | 1115 |
| 16 | 1635 |
| 17 | 2351 |
| 18 | 3375 |
| 19 | 4770 |
| 20 | 6725 |
| 21 | 9368 |
| 22 | 13006 |
| 23 | 17885 |
| 24 | 24510 |
| 25 | 33319 |
| 26 | 45139 |
| 27 | 60743 |
| 28 | 81457 |
| 29 | 108610 |
| 30 | 144334 |
| 31 | 190844 |
| 32 | 251542 |
| 33 | 330082 |
| 34 | 431825 |
| 35 | 562710 |
| 36 | 731154 |
| 37 | 946644 |
| 38 | 1222305 |
| 39 | 1573155 |
| 40 | 2019471 |
[1,2,5,9,18,30,53,85,139,215,336,504,760,1115, 1635,2351,3375,4770,6725,9368,13006,17885,24510, 33319,45139,60743,81457,108610,144334,190844, 251542,330082,431825,562710,731154,946644,1222305, 1573155,2019471] |