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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 6 |
| 3 | 7 |
| 4 | 28 |
| 5 | 63 |
| 6 | 56 |
| 7 | 223 |
| 8 | 432 |
| 9 | 127 |
| 10 | 1248 |
| 11 | 3967 |
| 12 | 8128 |
| 13 | 2047 |
| 14 | 28544 |
| 15 | 55807 |
| 16 | 47872 |
| 17 | 229375 |
| 18 | 196096 |
| 19 | 886783 |
| 20 | 777216 |
| 21 | 3653631 |
| 22 | 2914304 |
| 23 | 13033471 |
| 24 | 12382208 |
| 25 | 63438847 |
| 26 | 62971904 |
| 27 | 265256959 |
| 28 | 264749056 |
| 29 | 968359935 |
| 30 | 811827200 |
| 31 | 3891658751 |
| 32 | 3237937152 |
| 33 | 15527313407 |
[1,3,6,7,28,63,56,223,432,127,1248,3967,8128,2047, 28544,55807,47872,229375,196096,886783,777216, 3653631,2914304,13033471,12382208,63438847, 62971904,265256959,264749056,968359935,811827200, 3891658751,3237937152,15527313407] |