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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 9 |
| 3 | 15 |
| 4 | 21 |
| 5 | 33 |
| 6 | 38 |
| 7 | 58 |
| 8 | 86 |
| 9 | 106 |
| 10 | 122 |
| 11 | 485 |
| 12 | 905 |
| 13 | 1939 |
| 14 | 4163 |
| 15 | 6697 |
| 16 | 12381 |
| 17 | 14473 |
| 18 | 22889 |
| 19 | 107833 |
| 20 | 170769 |
| 21 | 370729 |
| 22 | 687634 |
| 23 | 804106 |
| 24 | 1093762 |
| 25 | 1276259 |
| 26 | 2767999 |
| 27 | 11140379 |
| 28 | 15186449 |
| 29 | 210634829 |
| 30 | 286937249 |
| 31 | 391048473 |
| 32 | 532793518 |
| 33 | 725995178 |
| 34 | 847539571 |
[4,9,15,21,33,38,58,86,106,122,485,905,1939,4163, 6697,12381,14473,22889,107833,170769,370729, 687634,804106,1093762,1276259,2767999,11140379, 15186449,210634829,286937249,391048473,532793518, 725995178,847539571] |