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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 32 |
| 7 | 128 |
| 8 | 512 |
| 9 | 1948 |
| 10 | 6963 |
| 11 | 24576 |
| 12 | 87380 |
| 13 | 317440 |
| 14 | 1179648 |
| 15 | 4438966 |
| 16 | 16777216 |
| 17 | 63409935 |
| 18 | 239541344 |
| 19 | 905969664 |
| 20 | 3435973836 |
| 21 | 13076616480 |
| 22 | 49928994816 |
| 23 | 191126044672 |
| 24 | 733007751680 |
| 25 | 2815437297416 |
| 26 | 10828603699515 |
| 27 | 41705086880768 |
| 28 | 160842843834660 |
[1,1,2,4,8,32,128,512,1948,6963,24576,87380, 317440,1179648,4438966,16777216,63409935, 239541344,905969664,3435973836,13076616480, 49928994816,191126044672,733007751680, 2815437297416,10828603699515,41705086880768, 160842843834660] |