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 | 3 |
| 3 | 8 |
| 4 | 21 |
| 5 | 50 |
| 6 | 111 |
| 7 | 236 |
| 8 | 489 |
| 9 | 998 |
| 10 | 2019 |
| 11 | 4064 |
| 12 | 8157 |
| 13 | 16346 |
| 14 | 32727 |
| 15 | 65492 |
| 16 | 131025 |
| 17 | 262094 |
| 18 | 524235 |
| 19 | 1048520 |
| 20 | 2097093 |
| 21 | 4194242 |
| 22 | 8388543 |
| 23 | 16777148 |
| 24 | 33554361 |
| 25 | 67108790 |
| 26 | 134217651 |
| 27 | 268435376 |
| 28 | 536870829 |