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 | 251 |
| 3 | 619 |
| 4 | 1289 |
| 5 | 2393 |
| 6 | 6551 |
| 7 | 14629 |
| 8 | 28547 |
| 9 | 65519 |
| 10 | 159979 |
| 11 | 279817 |
| 12 | 456949 |
| 13 | 2313401 |
| 14 | 2559959 |
| 15 | 3111653 |
| 16 | 3748051 |
| 17 | 6249949 |
| 18 | 7890427 |
| 19 | 9150569 |
| 20 | 10555943 |
| 21 | 12959939 |
| 22 | 13845779 |
| 23 | 21381307 |
| 24 | 25411609 |
| 25 | 35152963 |
| 26 | 38950001 |
| 27 | 45212093 |