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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 3 |
| 5 | 11 |
| 6 | 35 |
| 7 | 111 |
| 8 | 343 |
| 9 | 1050 |
| 10 | 3186 |
| 11 | 9615 |
| 12 | 28897 |
| 13 | 86592 |
| 14 | 258908 |
| 15 | 772863 |
| 16 | 2304225 |
| 17 | 6863496 |
| 18 | 20429784 |
| 19 | 60779403 |
| 20 | 180751617 |
| 21 | 537386595 |
| 22 | 1597372371 |
| 23 | 4747537641 |
| 24 | 14108988509 |
| 25 | 41928203694 |
| 26 | 124598731750 |
| 27 | 370279082745 |
| 28 | 1100428538391 |
| 29 | 3270534249843 |
[1,3,11,35,111,343,1050,3186,9615,28897,86592, 258908,772863,2304225,6863496,20429784,60779403, 180751617,537386595,1597372371,4747537641, 14108988509,41928203694,124598731750,370279082745, 1100428538391,3270534249843] |