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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 5 |
| 7 | 6 |
| 8 | 7 |
| 9 | 8 |
| 10 | 9 |
| 11 | 11 |
| 12 | 22 |
| 13 | 252 |
| 14 | 616 |
| 15 | 757 |
| 16 | 838 |
| 17 | 919 |
| 18 | 10301 |
| 19 | 13031 |
| 20 | 15951 |
| 21 | 17871 |
| 22 | 65856 |
| 23 | 1197911 |
| 24 | 2287822 |
| 25 | 4385834 |
| 26 | 5475745 |
| 27 | 5549455 |
| 28 | 6278726 |
| 29 | 6639366 |
| 30 | 7368637 |
| 31 | 7573757 |
| 32 | 8663668 |
| 33 | 8737378 |
| 34 | 9392939 |
| 35 | 9466649 |
| 36 | 9827289 |
| 37 | 67166176 |
| 38 | 214171412 |
| 39 | 609808906 |
| 40 | 836040638 |
| 41 | 2132882312 |
| 42 | 2487997842 |