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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 3 |
| 5 | 8 |
| 6 | 9 |
| 7 | 21 |
| 8 | 25 |
| 9 | 54 |
| 10 | 68 |
| 11 | 139 |
| 12 | 183 |
| 13 | 358 |
| 14 | 489 |
| 15 | 924 |
| 16 | 1301 |
| 17 | 2390 |
| 18 | 3450 |
| 19 | 6194 |
| 20 | 9126 |
| 21 | 16080 |
| 22 | 24093 |
| 23 | 41805 |
| 24 | 63507 |
| 25 | 108817 |
| 26 | 167188 |
| 27 | 283533 |
| 28 | 439689 |
| 29 | 739391 |
| 30 | 1155384 |
| 31 | 1929504 |
| 32 | 3033991 |
| 33 | 5038089 |
| 34 | 7962758 |
| 35 | 13161067 |
| 36 | 20889012 |
| 37 | 34394215 |
| 38 | 54778872 |
[0,1,1,3,3,8,9,21,25,54,68,139,183,358,489,924, 1301,2390,3450,6194,9126,16080,24093,41805,63507, 108817,167188,283533,439689,739391,1155384, 1929504,3033991,5038089,7962758,13161067,20889012, 34394215,54778872] |