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 | 462 |
| 2 | 1734 |
| 3 | 6534 |
| 4 | 24582 |
| 5 | 92478 |
| 6 | 347934 |
| 7 | 1309038 |
| 8 | 4924998 |
| 9 | 18529350 |
| 10 | 69713094 |
| 11 | 262282014 |
| 12 | 986785278 |
| 13 | 3712588494 |
| 14 | 13967895174 |
| 15 | 52551500358 |
| 16 | 197714842182 |
| 17 | 743863801278 |
| 18 | 2798643484446 |
| 19 | 10529354082798 |
| 20 | 39614655463302 |