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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 7 |
| 5 | 33 |
| 6 | 130 |
| 7 | 463 |
| 8 | 1557 |
| 9 | 5031 |
| 10 | 15877 |
| 11 | 49240 |
| 12 | 151116 |
| 13 | 460173 |
| 14 | 1394645 |
| 15 | 4212071 |
| 16 | 12693724 |
| 17 | 38195286 |
| 18 | 114817389 |
| 19 | 344911117 |
| 20 | 1035659955 |
| 21 | 3108817911 |
| 22 | 9330152740 |
| 23 | 27997803871 |
| 24 | 84008165515 |
| 25 | 252053831034 |
| 26 | 756220333901 |
| 27 | 2268778132337 |
| 28 | 6806569134920 |
| 29 | 20420175154486 |
[1,7,33,130,463,1557,5031,15877,49240,151116, 460173,1394645,4212071,12693724,38195286, 114817389,344911117,1035659955,3108817911, 9330152740,27997803871,84008165515,252053831034, 756220333901,2268778132337,6806569134920, 20420175154486] |