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 | 2 |
| 4 | 6 |
| 5 | 16 |
| 6 | 39 |
| 7 | 99 |
| 8 | 271 |
| 9 | 763 |
| 10 | 2146 |
| 11 | 6062 |
| 12 | 17359 |
| 13 | 50337 |
| 14 | 147057 |
| 15 | 431874 |
| 16 | 1275273 |
| 17 | 3786649 |
| 18 | 11298031 |
| 19 | 33846202 |
| 20 | 101762937 |
| 21 | 306997821 |
| 22 | 929038518 |
| 23 | 2819426688 |
| 24 | 8578433304 |
| 25 | 26163061776 |
| 26 | 79970186791 |
| 27 | 244938841096 |
| 28 | 751646959402 |
| 29 | 2310683396056 |
| 30 | 7115199919151 |