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 | 7 |
| 3 | 17 |
| 4 | 41 |
| 5 | 731 |
| 6 | 8563 |
| 7 | 27719 |
| 8 | 190073 |
| 9 | 516149 |
| 10 | 1013143139 |
| 11 | 1519024289 |
| 12 | 14108351869 |
| 13 | 14399405173 |
| 14 | 23142912688967 |
| 15 | 83945247395407 |
| 16 | 84894728616107 |
| 17 | 3204549982389941 |
| 18 | 262488267575333123 |
| 19 | 9027726081126601799 |
| 20 | 2026692221793223022131 |
| 21 | 1375035304877251309001 |