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 | 3139 |
| 2 | 180325 |
| 3 | 2636263 |
| 4 | 19610233 |
| 5 | 97464799 |
| 6 | 370487485 |
| 7 | 1163205475 |
| 8 | 3164588407 |
| 9 | 7702189345 |
| 10 | 17148949027 |
| 11 | 35500063501 |
| 12 | 69161990275 |
| 13 | 128000343121 |
| 14 | 226698100687 |
| 15 | 386480229085 |
| 16 | 637265493637 |
| 17 | 1020310909975 |
| 18 | 1591418959705 |
| 19 | 2424782370859 |
| 20 | 3617545938373 |
| 21 | 5295169534843 |