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 | 2 |
| 1 | 9 |
| 2 | 37 |
| 3 | 149 |
| 4 | 597 |
| 5 | 2389 |
| 6 | 9557 |
| 7 | 38229 |
| 8 | 152917 |
| 9 | 611669 |
| 10 | 2446677 |
| 11 | 9786709 |
| 12 | 39146837 |
| 13 | 156587349 |
| 14 | 626349397 |
| 15 | 2505397589 |
| 16 | 10021590357 |
| 17 | 40086361429 |
| 18 | 160345445717 |
| 19 | 641381782869 |
| 20 | 2565527131477 |
| 21 | 10262108525909 |
| 22 | 41048434103637 |
| 23 | 164193736414549 |
| 24 | 656774945658197 |