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 | 4 |
| 1 | 1 |
| 2 | 5 |
| 3 | 1 |
| 4 | 109 |
| 5 | 1460 |
| 6 | 292 |
| 7 | 53476 |
| 8 | 124904 |
| 9 | 993169 |
| 10 | 5385572 |
| 11 | 43930532 |
| 12 | 239139524 |
| 13 | 777233593 |
| 14 | 789206948 |
| 15 | 2256445369 |
| 16 | 65340851012 |
| 17 | 661111023620 |
| 18 | 132222204724 |
| 19 | 7745142596633 |
| 20 | 10225443529556 |
| 21 | 103321258570120 |
| 22 | 20664251714024 |
| 23 | 4562022446935993 |
| 24 | 6246398287209928 |
| 25 | 20888388201358465 |