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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 17 |
| 3 | 13 |
| 4 | 34 |
| 5 | 71 |
| 6 | 135 |
| 7 | 356 |
| 8 | 734 |
| 9 | 1705 |
| 10 | 3914 |
| 11 | 8291 |
| 12 | 19714 |
| 13 | 42700 |
| 14 | 93528 |
| 15 | 214479 |
| 16 | 462299 |
| 17 | 1030477 |
| 18 | 2304077 |
| 19 | 5035291 |
| 20 | 11240675 |
| 21 | 24870524 |
| 22 | 54876698 |
| 23 | 121998539 |
| 24 | 269425049 |
| 25 | 596725510 |
| 26 | 1322494224 |
| 27 | 2923575132 |
| 28 | 6478965125 |
| 29 | 14341026682 |
[4,17,13,34,71,135,356,734,1705,3914,8291,19714, 42700,93528,214479,462299,1030477,2304077,5035291, 11240675,24870524,54876698,121998539,269425049, 596725510,1322494224,2923575132,6478965125, 14341026682] |