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) |
|---|---|
| 2 | 1 |
| 3 | 19 |
| 4 | 115 |
| 5 | 3799 |
| 6 | 4669 |
| 7 | 268921 |
| 8 | 1227199 |
| 9 | 12335311 |
| 10 | 13560283 |
| 11 | 1781891563 |
| 12 | 1916566873 |
| 13 | 345677548297 |
| 14 | 366562289317 |
| 15 | 386631866845 |
| 16 | 1623817435135 |
| 17 | 490825547301775 |
| 18 | 511634386192615 |
| 19 | 191966753701218895 |
| 20 | 199005637912597915 |
| 21 | 205832222367859915 |
| 22 | 212460475248691315 |