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 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 13 |
| 5 | 20 |
| 6 | 62 |
| 7 | 113 |
| 8 | 224 |
| 9 | 367 |
| 10 | 494 |
| 11 | 833 |
| 12 | 9169 |
| 13 | 131313 |
| 14 | 155719 |
| 15 | 180118 |
| 16 | 280766754 |
| 17 | 3454917187 |
| 18 | 31685027464 |
| 19 | 152431947617 |
| 20 | 629621648241 |