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 | 1 |
| 1 | 7 |
| 2 | 31 |
| 3 | 109 |
| 4 | 331 |
| 5 | 4529 |
| 6 | 11453 |
| 7 | 190433 |
| 8 | 61391 |
| 9 | 928943 |
| 10 | 9677971 |
| 11 | 214858067 |
| 12 | 60236303 |
| 13 | 10492980947 |
| 14 | 137504412401 |
| 15 | 180206776249 |
| 16 | 2272545257401 |
| 17 | 68446106098751 |
| 18 | 119418042814439 |
| 19 | 3899046884359 |
| 20 | 33130663362484669 |