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 | 3 |
| 2 | 5 |
| 3 | 9 |
| 4 | 19 |
| 5 | 49 |
| 6 | 155 |
| 7 | 591 |
| 8 | 2651 |
| 9 | 13689 |
| 10 | 80009 |
| 11 | 522193 |
| 12 | 3762273 |
| 13 | 29629483 |
| 14 | 252966249 |
| 15 | 2325176147 |
| 16 | 22874076091 |
| 17 | 239615657133 |
| 18 | 2661015200515 |
| 19 | 31207545002577 |
| 20 | 385191232715737 |
| 21 | 4988767088734625 |
| 22 | 67615869255979521 |