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 | 21 |
| 2 | 1845 |
| 3 | 45036 |
| 4 | 1580681 |
| 5 | 56630842 |
| 6 | 1906300826 |
| 7 | 65775301075 |
| 8 | 2265577299182 |
| 9 | 77814433907002 |
| 10 | 2676719924368494 |
| 11 | 92051980153163166 |
| 12 | 3165307212249071372 |
| 13 | 108852027486036181894 |
| 14 | 3743236634629271063055 |
| 15 | 128723199495612208662339 |