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 | 13 |
| 2 | 169 |
| 3 | 699 |
| 4 | 2942 |
| 5 | 14253 |
| 6 | 68745 |
| 7 | 343310 |
| 8 | 1714707 |
| 9 | 8658045 |
| 10 | 43808202 |
| 11 | 222697019 |
| 12 | 1134527403 |
| 13 | 5795073744 |
| 14 | 29653954449 |
| 15 | 152010652165 |
| 16 | 780332029484 |
| 17 | 4010975606113 |
| 18 | 20639771978707 |
| 19 | 106316035774240 |
| 20 | 548128063053109 |