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) |
|---|---|
| 2 | 115 |
| 3 | 1063 |
| 4 | 9121 |
| 5 | 75607 |
| 6 | 611569 |
| 7 | 4857223 |
| 8 | 38034241 |
| 9 | 294475447 |
| 10 | 2258978449 |
| 11 | 17196401383 |
| 12 | 130059675361 |
| 13 | 978211787287 |
| 14 | 7322040929329 |
| 15 | 54576195433543 |
| 16 | 405286730532481 |
| 17 | 2999780651211127 |
| 18 | 22137879320864209 |
| 19 | 162941058582753703 |
| 20 | 1196418733436205601 |