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) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 14 |
| 4 | 31 |
| 5 | 127 |
| 6 | 206 |
| 7 | 2974 |
| 8 | 8191 |
| 9 | 19358 |
| 10 | 20490 |
| 11 | 131071 |
| 12 | 147454 |
| 13 | 286122 |
| 14 | 289650 |
| 15 | 292332 |
| 16 | 441276 |
| 17 | 524287 |
| 18 | 909498 |
| 19 | 1207358 |
| 20 | 1657968 |
| 21 | 1782540 |
| 22 | 2490042 |
| 23 | 3368860 |
| 24 | 9274806 |
| 25 | 11367402 |
| 26 | 14107852 |
| 27 | 16776156 |
| 28 | 18589386 |
| 29 | 22910988 |
| 30 | 24450316 |
| 31 | 26867718 |
| 32 | 28959606 |
| 33 | 32674506 |
| 34 | 33163372 |