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 | 2 |
| 1 | 3 |
| 2 | 7 |
| 3 | 19 |
| 4 | 56 |
| 5 | 174 |
| 6 | 561 |
| 7 | 1859 |
| 8 | 6292 |
| 9 | 21658 |
| 10 | 75582 |
| 11 | 266798 |
| 12 | 950912 |
| 13 | 3417340 |
| 14 | 12369285 |
| 15 | 45052515 |
| 16 | 165002460 |
| 17 | 607283490 |
| 18 | 2244901890 |
| 19 | 8331383610 |
| 20 | 31030387440 |
| 21 | 115948830660 |
| 22 | 434542177290 |
| 23 | 1632963760974 |
| 24 | 6151850548776 |