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 | 1 |
| 1 | 7 |
| 2 | 19 |
| 3 | 43 |
| 4 | 91 |
| 5 | 187 |
| 6 | 379 |
| 7 | 763 |
| 8 | 1531 |
| 9 | 3067 |
| 10 | 6139 |
| 11 | 12283 |
| 12 | 24571 |
| 13 | 49147 |
| 14 | 98299 |
| 15 | 196603 |
| 16 | 393211 |
| 17 | 786427 |
| 18 | 1572859 |
| 19 | 3145723 |
| 20 | 6291451 |
| 21 | 12582907 |
| 22 | 25165819 |
| 23 | 50331643 |
| 24 | 100663291 |
| 25 | 201326587 |
| 26 | 402653179 |
| 27 | 805306363 |
| 28 | 1610612731 |