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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 5 |
| 7 | 8 |
| 8 | 16 |
| 9 | 30 |
| 10 | 58 |
| 11 | 108 |
| 12 | 214 |
| 13 | 401 |
| 14 | 781 |
| 15 | 1493 |
| 16 | 2888 |
| 17 | 5536 |
| 18 | 10705 |
| 19 | 20569 |
| 20 | 39707 |
| 21 | 76433 |
| 22 | 147420 |
| 23 | 283953 |
| 24 | 547566 |
| 25 | 1055028 |
| 26 | 2034029 |
| 27 | 3919974 |
| 28 | 7556717 |
| 29 | 14564533 |
| 30 | 28075593 |
| 31 | 54114452 |
| 32 | 104311848 |
| 33 | 201062094 |
| 34 | 387564973 |
| 35 | 747044844 |
| 36 | 1439986130 |
| 37 | 2775641472 |
| 38 | 5350241528 |
| 39 | 10312882883 |
[0,0,1,1,2,5,8,16,30,58,108,214,401,781,1493,2888, 5536,10705,20569,39707,76433,147420,283953,547566, 1055028,2034029,3919974,7556717,14564533,28075593, 54114452,104311848,201062094,387564973,747044844, 1439986130,2775641472,5350241528,10312882883] |