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) |
|---|---|
| 0 | 7 |
| 1 | 24 |
| 2 | 101 |
| 3 | 477 |
| 4 | 2411 |
| 5 | 12729 |
| 6 | 69251 |
| 7 | 385017 |
| 8 | 2175491 |
| 9 | 12444489 |
| 10 | 71865251 |
| 11 | 418096857 |
| 12 | 2446626371 |
| 13 | 14383667049 |
| 14 | 84875140451 |
| 15 | 502327573497 |
| 16 | 2980183394051 |
| 17 | 17715498038409 |
| 18 | 105478120962851 |
| 19 | 628846706246937 |
| 20 | 3753178627502531 |
| 21 | 22420395331846569 |