This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 4 |
| 3 | 14 |
| 4 | 16 |
| 5 | 42 |
| 6 | 76 |
| 7 | 142 |
| 8 | 256 |
| 9 | 554 |
| 10 | 1044 |
| 11 | 2070 |
| 12 | 4144 |
| 13 | 8218 |
| 14 | 16412 |
| 15 | 32934 |
| 16 | 65536 |
| 17 | 131106 |
| 18 | 262372 |
| 19 | 524326 |
| 20 | 1048656 |
| 21 | 2097634 |
| 22 | 4194348 |
| 23 | 8388654 |
| 24 | 16777984 |
| 25 | 33554642 |
| 26 | 67108916 |
| 27 | 134219390 |
| 28 | 268435568 |
| 29 | 536870970 |
| 30 | 1073745276 |
| 31 | 2147483710 |