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 | 19 |
| 2 | 43 |
| 3 | 67 |
| 4 | 163 |
| 5 | 222643 |
| 6 | 1333963 |
| 7 | 2404147 |
| 8 | 20950603 |
| 9 | 51599563 |
| 10 | 96295483 |
| 11 | 146161723 |
| 12 | 1408126003 |
| 13 | 3341091163 |
| 14 | 52947440683 |
| 15 | 193310265163 |
| 16 | 229565917267 |
| 17 | 915809911867 |
| 18 | 1432817816347 |
| 19 | 30059924764123 |
| 20 | 3126717241727227 |
| 21 | 8842819893041227 |
| 22 | 13688678408873323 |
| 23 | 22261805373620443 |
| 24 | 4908856524312968467 |
| 25 | 7961860547428719787 |