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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 6 |
| 3 | 12 |
| 4 | 22 |
| 5 | 42 |
| 6 | 80 |
| 7 | 152 |
| 8 | 284 |
| 9 | 536 |
| 10 | 988 |
| 11 | 1848 |
| 12 | 3412 |
| 13 | 6352 |
| 14 | 11724 |
| 15 | 21718 |
| 16 | 39952 |
| 17 | 73808 |
| 18 | 135668 |
| 19 | 250188 |
| 20 | 459172 |
| 21 | 844888 |
| 22 | 1548608 |
| 23 | 2845186 |
| 24 | 5211548 |
| 25 | 9563768 |
| 26 | 17501272 |
| 27 | 32079524 |
| 28 | 58660712 |
| 29 | 107425356 |
| 30 | 196320596 |
| 31 | 359232144 |
| 32 | 656099656 |
| 33 | 1199676412 |
| 34 | 2189995764 |
[1,3,6,12,22,42,80,152,284,536,988,1848,3412,6352, 11724,21718,39952,73808,135668,250188,459172, 844888,1548608,2845186,5211548,9563768,17501272, 32079524,58660712,107425356,196320596,359232144, 656099656,1199676412,2189995764] |