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 | 5 |
| 3 | 36 |
| 4 | 289 |
| 5 | 3433 |
| 6 | 47578 |
| 7 | 842499 |
| 8 | 16850338 |
| 9 | 389415029 |
| 10 | 10010878371 |
| 11 | 285679026506 |
| 12 | 8918295095267 |
| 13 | 302973286652448 |
| 14 | 11112691430262573 |
| 15 | 437929106387544254 |
| 16 | 18447028378472722051 |
| 17 | 827256956775203666857 |
| 18 | 39346558275376372606086 |
| 19 | 1978429667078835508142129 |