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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 9 |
| 6 | 21 |
| 7 | 41 |
| 8 | 75 |
| 9 | 141 |
| 10 | 281 |
| 11 | 577 |
| 12 | 1179 |
| 13 | 2369 |
| 14 | 4709 |
| 15 | 9353 |
| 16 | 18659 |
| 17 | 37365 |
| 18 | 74889 |
| 19 | 149937 |
| 20 | 299827 |
| 21 | 599289 |
| 22 | 1198101 |
| 23 | 2396137 |
| 24 | 4793051 |
| 25 | 9587421 |
| 26 | 19175449 |
| 27 | 38349409 |
| 28 | 76695403 |
| 29 | 153388273 |
| 30 | 306778917 |
| 31 | 613566153 |
| 32 | 1227140787 |
| 33 | 2454279365 |