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 | 877 |
| 2 | 4139 |
| 3 | 20891 |
| 4 | 106133 |
| 5 | 503295 |
| 6 | 2134122 |
| 7 | 8016373 |
| 8 | 26869727 |
| 9 | 81381744 |
| 10 | 225620777 |
| 11 | 579251337 |
| 12 | 1390969632 |
| 13 | 3150473373 |
| 14 | 6777961885 |
| 15 | 13933402774 |
| 16 | 27505504247 |
| 17 | 52363544091 |
| 18 | 96485126179 |
| 19 | 172610924931 |
| 20 | 300625072411 |