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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 19 |
| 6 | 17 |
| 7 | 1 |
| 8 | 409 |
| 9 | 604 |
| 10 | 82 |
| 11 | 20951 |
| 12 | 229931 |
| 13 | 411012 |
| 14 | 39080794 |
| 15 | 4382914408 |
| 16 | 6345486566 |
| 17 | 45119290746 |
| 18 | 581075656330 |
| 19 | 8672770990 |
| 20 | 869561574799171 |
| 21 | 71853663603175593 |
| 22 | 25509154378676494 |
| 23 | 24040267482771436703 |
| 24 | 102403319155457392955 |
| 25 | 11302410854347731819765 |