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 | 19 |
| 3 | 205 |
| 4 | 1795 |
| 5 | 14221 |
| 6 | 106819 |
| 7 | 778765 |
| 8 | 5581315 |
| 9 | 39606541 |
| 10 | 279447619 |
| 11 | 1965098125 |
| 12 | 13792018435 |
| 13 | 96690872461 |
| 14 | 677427332419 |
| 15 | 4744368982285 |
| 16 | 33220131761155 |
| 17 | 232579232659981 |
| 18 | 1628208214321219 |
| 19 | 11398072876175245 |
| 20 | 79788974736297475 |
| 21 | 558532690864457101 |