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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 17 |
| 5 | 36 |
| 6 | 80 |
| 7 | 178 |
| 8 | 409 |
| 9 | 942 |
| 10 | 2212 |
| 11 | 5204 |
| 12 | 12377 |
| 13 | 29472 |
| 14 | 70592 |
| 15 | 169198 |
| 16 | 406801 |
| 17 | 978426 |
| 18 | 2357092 |
| 19 | 5679488 |
| 20 | 13696385 |
| 21 | 33032892 |
| 22 | 79703120 |
| 23 | 192321034 |
| 24 | 464168041 |
| 25 | 1120302822 |
| 26 | 2704242244 |
| 27 | 6527724428 |
| 28 | 15758096777 |
| 29 | 38040729336 |
| 30 | 91834772480 |
[1,2,4,8,17,36,80,178,409,942,2212,5204,12377, 29472,70592,169198,406801,978426,2357092,5679488, 13696385,33032892,79703120,192321034,464168041, 1120302822,2704242244,6527724428,15758096777, 38040729336,91834772480] |