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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 7 |
| 3 | 15 |
| 4 | 33 |
| 5 | 63 |
| 6 | 99 |
| 7 | 147 |
| 8 | 201 |
| 9 | 311 |
| 10 | 423 |
| 11 | 543 |
| 12 | 723 |
| 13 | 843 |
| 14 | 969 |
| 15 | 1199 |
| 16 | 1511 |
| 17 | 1743 |
| 18 | 1983 |
| 19 | 2313 |
| 20 | 2523 |
| 21 | 2811 |
| 22 | 3201 |
| 23 | 3611 |
| 24 | 4227 |
| 25 | 4803 |
| 26 | 5103 |
| 27 | 5409 |
| 28 | 5727 |
| 29 | 6051 |
| 30 | 7059 |
| 31 | 8193 |
| 32 | 8843 |
| 33 | 9387 |
| 34 | 10215 |
| 35 | 11103 |
| 36 | 11703 |
| 37 | 12639 |
| 38 | 13449 |
| 39 | 14279 |
| 40 | 15311 |
| 41 | 16023 |
| 42 | 17103 |
| 43 | 18243 |
| 44 | 18819 |
| 45 | 19407 |
[4,7,15,33,63,99,147,201,311,423,543,723,843,969, 1199,1511,1743,1983,2313,2523,2811,3201,3611,4227, 4803,5103,5409,5727,6051,7059,8193,8843,9387, 10215,11103,11703,12639,13449,14279,15311,16023, 17103,18243,18819,19407] |