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 | 3 |
| 3 | 11 |
| 4 | 100 |
| 5 | 1063 |
| 6 | 15686 |
| 7 | 271975 |
| 8 | 5509456 |
| 9 | 126604661 |
| 10 | 3256687324 |
| 11 | 92655915831 |
| 12 | 2888838414540 |
| 13 | 97940953019995 |
| 14 | 3587315304010374 |
| 15 | 141162897496953263 |
| 16 | 5939167862427259456 |
| 17 | 266046178356979847881 |
| 18 | 12641661811772879875640 |
| 19 | 635092155152649300232063 |
| 20 | 33633813271235206436451100 |