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 | 7 |
| 2 | 71 |
| 3 | 769 |
| 4 | 8449 |
| 5 | 93127 |
| 6 | 1027207 |
| 7 | 11332097 |
| 8 | 125019649 |
| 9 | 1379271559 |
| 10 | 15216755911 |
| 11 | 167878292737 |
| 12 | 1852111179521 |
| 13 | 20433349871431 |
| 14 | 225430197438727 |
| 15 | 2487050546734081 |
| 16 | 27438295728380929 |
| 17 | 302712011022644999 |
| 18 | 3339659377008916807 |
| 19 | 36844671993005504257 |
| 20 | 406487518942362537217 |