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 | 1 |
| 2 | 9 |
| 3 | 13 |
| 4 | 49 |
| 5 | 101 |
| 6 | 297 |
| 7 | 701 |
| 8 | 1889 |
| 9 | 4693 |
| 10 | 12249 |
| 11 | 31021 |
| 12 | 80017 |
| 13 | 204101 |
| 14 | 524169 |
| 15 | 1340573 |
| 16 | 3437249 |
| 17 | 8799541 |
| 18 | 22548537 |
| 19 | 57746701 |
| 20 | 147940849 |
| 21 | 378927653 |
| 22 | 970691049 |
| 23 | 2486401661 |
| 24 | 6369165857 |
| 25 | 16314772501 |
| 26 | 41791435929 |
| 27 | 107050525933 |
| 28 | 274216269649 |
| 29 | 702418373381 |