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 | 0 |
| 1 | 1 |
| 2 | 13 |
| 3 | 136 |
| 4 | 1370 |
| 5 | 13715 |
| 6 | 137171 |
| 7 | 1371738 |
| 8 | 13717416 |
| 9 | 137174205 |
| 10 | 1371742105 |
| 11 | 13717421116 |
| 12 | 137174211238 |
| 13 | 1371742112471 |
| 14 | 13717421124815 |
| 15 | 137174211248270 |
| 16 | 1371742112482836 |
| 17 | 13717421124828513 |
| 18 | 137174211248285301 |
| 19 | 1371742112482853200 |
| 20 | 13717421124828532210 |