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 | 17 |
| 3 | 18 |
| 4 | 89 |
| 5 | 196 |
| 6 | 1461 |
| 7 | 1657 |
| 8 | 3118 |
| 9 | 7893 |
| 10 | 18904 |
| 11 | 140221 |
| 12 | 579788 |
| 13 | 720009 |
| 14 | 2019806 |
| 15 | 2739815 |
| 16 | 166408706 |
| 17 | 169148521 |
| 18 | 673854269 |
| 19 | 843002790 |
| 20 | 2359859849 |
| 21 | 19721881582 |
| 22 | 100969267759 |
| 23 | 120691149341 |
| 24 | 342351566441 |
| 25 | 463042715782 |
| 26 | 805394282223 |
| 27 | 1268436998005 |
| 28 | 7147579272248 |