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A013025 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 16 |
| 5 | 34 |
| 6 | 88 |
| 7 | 296 |
| 8 | 1152 |
| 9 | 4546 |
| 10 | 17696 |
| 11 | 72712 |
| 12 | 343424 |
| 13 | 1843170 |
| 14 | 10274688 |
| 15 | 56506024 |
| 16 | 315332608 |
| 17 | 1910439298 |
| 18 | 12815815168 |
| 19 | 90064672520 |
| 20 | 629185325056 |
| 21 | 4400756254114 |
| 22 | 32422278027264 |
| 23 | 258933905154856 |
| 24 | 2168521319694336 |
[1,2,4,8,16,34,88,296,1152,4546,17696,72712, 343424,1843170,10274688,56506024,315332608, 1910439298,12815815168,90064672520,629185325056, 4400756254114,32422278027264,258933905154856, 2168521319694336] |