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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 7 |
| 4 | 13 |
| 5 | 23 |
| 6 | 41 |
| 7 | 72 |
| 8 | 128 |
| 9 | 226 |
| 10 | 400 |
| 11 | 706 |
| 12 | 1248 |
| 13 | 2204 |
| 14 | 3894 |
| 15 | 6877 |
| 16 | 12149 |
| 17 | 21459 |
| 18 | 37907 |
| 19 | 66957 |
| 20 | 118275 |
| 21 | 208919 |
| 22 | 369037 |
| 23 | 651863 |
| 24 | 1151453 |
| 25 | 2033921 |
| 26 | 3592719 |
| 27 | 6346167 |
| 28 | 11209863 |
| 29 | 19801075 |
| 30 | 34976589 |
| 31 | 61782572 |
| 32 | 109132628 |
| 33 | 192771658 |
| 34 | 340511506 |
| 35 | 601478868 |
| 36 | 1062451154 |
| 37 | 1876711698 |
| 38 | 3315020026 |
[1,2,4,7,13,23,41,72,128,226,400,706,1248,2204, 3894,6877,12149,21459,37907,66957,118275,208919, 369037,651863,1151453,2033921,3592719,6346167, 11209863,19801075,34976589,61782572,109132628, 192771658,340511506,601478868,1062451154, 1876711698,3315020026] |