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 | 73 |
| 2 | 1135 |
| 3 | 7831 |
| 4 | 34147 |
| 5 | 111835 |
| 6 | 301645 |
| 7 | 707365 |
| 8 | 1492669 |
| 9 | 2900773 |
| 10 | 5276899 |
| 11 | 9093547 |
| 12 | 14978575 |
| 13 | 23746087 |
| 14 | 36430129 |
| 15 | 54321193 |
| 16 | 79005529 |
| 17 | 112407265 |
| 18 | 156833335 |
| 19 | 215021215 |
| 20 | 290189467 |
| 21 | 386091091 |