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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 14 |
| 5 | 30 |
| 6 | 76 |
| 7 | 185 |
| 8 | 430 |
| 9 | 1044 |
| 10 | 2544 |
| 11 | 6154 |
| 12 | 15002 |
| 13 | 36691 |
| 14 | 89918 |
| 15 | 220728 |
| 16 | 543054 |
| 17 | 1338428 |
| 18 | 3302916 |
| 19 | 8162806 |
| 20 | 20197554 |
| 21 | 50030332 |
| 22 | 124053930 |
| 23 | 307882669 |
| 24 | 764770230 |
| 25 | 1901144731 |
| 26 | 4729494390 |
| 27 | 11773517941 |
| 28 | 29327102054 |
| 29 | 73094698149 |
| 30 | 182280159290 |
[1,2,7,14,30,76,185,430,1044,2544,6154,15002, 36691,89918,220728,543054,1338428,3302916,8162806, 20197554,50030332,124053930,307882669,764770230, 1901144731,4729494390,11773517941,29327102054, 73094698149,182280159290] |