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 | 5 |
| 2 | 19 |
| 3 | 77 |
| 4 | 313 |
| 5 | 1277 |
| 6 | 5215 |
| 7 | 21305 |
| 8 | 87049 |
| 9 | 355685 |
| 10 | 1453363 |
| 11 | 5938613 |
| 12 | 24265921 |
| 13 | 99153677 |
| 14 | 405154783 |
| 15 | 1655515121 |
| 16 | 6764650225 |
| 17 | 27641241413 |
| 18 | 112945711027 |
| 19 | 461510880221 |
| 20 | 1885793543785 |
| 21 | 7705597945181 |
| 22 | 31486076453887 |
| 23 | 128656207802537 |