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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 27 |
| 5 | 59 |
| 6 | 147 |
| 7 | 309 |
| 8 | 680 |
| 9 | 1359 |
| 10 | 2745 |
| 11 | 5223 |
| 12 | 9923 |
| 13 | 18086 |
| 14 | 32732 |
| 15 | 57515 |
| 16 | 100133 |
| 17 | 170449 |
| 18 | 287377 |
| 19 | 475964 |
| 20 | 780971 |
| 21 | 1262965 |
| 22 | 2024448 |
| 23 | 3205891 |
| 24 | 5035293 |
| 25 | 7826984 |
| 26 | 12074562 |
| 27 | 18460301 |
| 28 | 28026831 |
| 29 | 42215156 |
| 30 | 63178973 |
| 31 | 93888989 |
| 32 | 138702881 |
| 33 | 203613174 |
| 34 | 297270739 |
| 35 | 431527023 |
[1,1,4,9,27,59,147,309,680,1359,2745,5223,9923, 18086,32732,57515,100133,170449,287377,475964, 780971,1262965,2024448,3205891,5035293,7826984, 12074562,18460301,28026831,42215156,63178973, 93888989,138702881,203613174,297270739,431527023] |