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 | 1 |
| 1 | 33 |
| 2 | 560 |
| 3 | 6512 |
| 4 | 58343 |
| 5 | 429319 |
| 6 | 2701215 |
| 7 | 14938495 |
| 8 | 74085099 |
| 9 | 334526731 |
| 10 | 1391777608 |
| 11 | 5386279880 |
| 12 | 19542335516 |
| 13 | 66903867676 |
| 14 | 217315477325 |
| 15 | 672858527085 |
| 16 | 1993883448271 |
| 17 | 5674663272047 |
| 18 | 15558879389713 |
| 19 | 41208936343729 |