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 | 7 |
| 2 | 29 |
| 3 | 117 |
| 4 | 469 |
| 5 | 1877 |
| 6 | 7509 |
| 7 | 30037 |
| 8 | 120149 |
| 9 | 480597 |
| 10 | 1922389 |
| 11 | 7689557 |
| 12 | 30758229 |
| 13 | 123032917 |
| 14 | 492131669 |
| 15 | 1968526677 |
| 16 | 7874106709 |
| 17 | 31496426837 |
| 18 | 125985707349 |
| 19 | 503942829397 |
| 20 | 2015771317589 |
| 21 | 8063085270357 |
| 22 | 32252341081429 |
| 23 | 129009364325717 |
| 24 | 516037457302869 |