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 | 5 |
| 3 | 12 |
| 4 | 25 |
| 5 | 54 |
| 6 | 113 |
| 7 | 232 |
| 8 | 477 |
| 9 | 970 |
| 10 | 1965 |
| 11 | 3972 |
| 12 | 8001 |
| 13 | 16094 |
| 14 | 32329 |
| 15 | 64864 |
| 16 | 130053 |
| 17 | 260594 |
| 18 | 521925 |
| 19 | 1044988 |
| 20 | 2091689 |
| 21 | 4185990 |
| 22 | 8375969 |
| 23 | 16757976 |
| 24 | 33525165 |
| 25 | 67064346 |
| 26 | 134149981 |
| 27 | 268332404 |
| 28 | 536714129 |
| 29 | 1073503278 |
| 30 | 2147120761 |