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 | 52 |
| 1 | 135 |
| 2 | 371 |
| 3 | 1075 |
| 4 | 3274 |
| 5 | 10457 |
| 6 | 56135 |
| 7 | 325269 |
| 8 | 2014321 |
| 9 | 13241402 |
| 10 | 91914202 |
| 11 | 670867539 |
| 12 | 5130574485 |
| 13 | 40989058693 |
| 14 | 341205653979 |
| 15 | 2952731951176 |
| 16 | 26510494023154 |
| 17 | 246500382677473 |
| 18 | 2369854608269687 |
| 19 | 23523121378151405 |
| 20 | 240746022804236085 |
| 21 | 2537378601343161682 |