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 | 2 |
| 2 | 9 |
| 3 | 28 |
| 4 | 71 |
| 5 | 162 |
| 6 | 349 |
| 7 | 728 |
| 8 | 1491 |
| 9 | 3022 |
| 10 | 6089 |
| 11 | 12228 |
| 12 | 24511 |
| 13 | 49082 |
| 14 | 98229 |
| 15 | 196528 |
| 16 | 393131 |
| 17 | 786342 |
| 18 | 1572769 |
| 19 | 3145628 |
| 20 | 6291351 |
| 21 | 12582802 |
| 22 | 25165709 |
| 23 | 50331528 |
| 24 | 100663171 |
| 25 | 201326462 |
| 26 | 402653049 |
| 27 | 805306228 |
| 28 | 1610612591 |
| 29 | 3221225322 |