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| n | a(n) |
|---|---|
| 4 | 3 |
| 5 | 9 |
| 6 | 73 |
| 7 | 230 |
| 8 | 1335 |
| 9 | 4376 |
| 10 | 22144 |
| 11 | 74766 |
| 12 | 351558 |
| 13 | 1213965 |
| 14 | 5458347 |
| 15 | 19181130 |
| 16 | 83735127 |
| 17 | 298391598 |
| 18 | 1276135088 |
| 19 | 4599546922 |
| 20 | 19380537318 |
| 21 | 70514368558 |
| 22 | 293838981413 |
| 23 | 1077617352348 |
| 24 | 4452600188602 |
| 25 | 16440039884624 |
| 26 | 67481063581593 |
| 27 | 250610375841434 |
| 28 | 1023303550651792 |
[3,9,73,230,1335,4376,22144,74766,351558,1213965, 5458347,19181130,83735127,298391598,1276135088, 4599546922,19380537318,70514368558,293838981413, 1077617352348,4452600188602,16440039884624, 67481063581593,250610375841434,1023303550651792] |