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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 23 |
| 5 | 323 |
| 6 | 647 |
| 7 | 971 |
| 8 | 7121 |
| 9 | 6943 |
| 10 | 185147 |
| 11 | 363173 |
| 12 | 179407463 |
| 13 | 412637165 |
| 14 | 20631858251 |
| 15 | 140035237 |
| 16 | 3716297449 |
| 17 | 27822060851939 |
| 18 | 2853544702763 |
| 19 | 58823785801243 |
| 20 | 568431869527163 |
| 21 | 279209361758899949 |
| 22 | 4944838261875010691 |