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 | 242 |
| 2 | 9922 |
| 3 | 170610 |
| 4 | 1690370 |
| 5 | 11414898 |
| 6 | 58227906 |
| 7 | 240089586 |
| 8 | 838478850 |
| 9 | 2564399090 |
| 10 | 7039035586 |
| 11 | 17664712562 |
| 12 | 41110086402 |
| 13 | 89719625842 |
| 14 | 185263467202 |
| 15 | 364571790066 |
| 16 | 687750033410 |
| 17 | 1249849661170 |
| 18 | 2197075886786 |
| 19 | 3748850875506 |
| 20 | 6227320558338 |
| 21 | 10096197409650 |