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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 45 |
| 5 | 153 |
| 6 | 517 |
| 7 | 1737 |
| 8 | 5829 |
| 9 | 19561 |
| 10 | 65637 |
| 11 | 220233 |
| 12 | 738949 |
| 13 | 2479401 |
| 14 | 8319141 |
| 15 | 27913225 |
| 16 | 93657285 |
| 17 | 314248425 |
| 18 | 1054398181 |
| 19 | 3537823689 |
| 20 | 11870464773 |
| 21 | 39828987049 |
| 22 | 133638255909 |
| 23 | 448396626825 |
| 24 | 1504505828677 |
| 25 | 5048070509673 |
| 26 | 16937798036325 |
| 27 | 56831417423689 |
| 28 | 190686534309765 |
| 29 | 639810795074601 |
[1,1,3,13,45,153,517,1737,5829,19561,65637,220233, 738949,2479401,8319141,27913225,93657285, 314248425,1054398181,3537823689,11870464773, 39828987049,133638255909,448396626825, 1504505828677,5048070509673,16937798036325, 56831417423689,190686534309765,639810795074601] |