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) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 12 |
| 4 | 37 |
| 5 | 71 |
| 6 | 216 |
| 7 | 414 |
| 8 | 1259 |
| 9 | 2413 |
| 10 | 7338 |
| 11 | 14064 |
| 12 | 42769 |
| 13 | 81971 |
| 14 | 249276 |
| 15 | 477762 |
| 16 | 1452887 |
| 17 | 2784601 |
| 18 | 8468046 |
| 19 | 16229844 |
| 20 | 49355389 |
| 21 | 94594463 |
| 22 | 287664288 |
| 23 | 551336934 |
| 24 | 1676630339 |
| 25 | 3213427141 |
| 26 | 9772117746 |
| 27 | 18729225912 |
| 28 | 56956076137 |
| 29 | 109161928331 |
| 30 | 331964339076 |