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 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 11 |
| 6 | 22 |
| 7 | 30 |
| 8 | 77 |
| 9 | 231 |
| 10 | 385 |
| 11 | 1575 |
| 12 | 3010 |
| 13 | 8349 |
| 14 | 17977 |
| 15 | 147273 |
| 16 | 386155 |
| 17 | 1741630 |
| 18 | 5392783 |
| 19 | 18004327 |
| 20 | 118114304 |
| 21 | 483502844 |
| 22 | 4351078600 |
| 23 | 22540654445 |
| 24 | 129913904637 |
| 25 | 1987276856363 |
| 26 | 15285151248481 |
| 27 | 133978259344888 |
| 28 | 365749566870782 |
| 29 | 3925922161489422 |
| 30 | 49005643635237875 |