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 | 1393 |
| 4 | 10621 |
| 5 | 75221 |
| 6 | 518001 |
| 7 | 3500117 |
| 8 | 23428181 |
| 9 | 155913829 |
| 10 | 1034324253 |
| 11 | 6848794157 |
| 12 | 45301138173 |
| 13 | 299456026377 |
| 14 | 1978795266229 |
| 15 | 13073066599357 |
| 16 | 86357724891721 |
| 17 | 570419071704225 |
| 18 | 3767635749133789 |
| 19 | 24884750059577649 |