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 | 4523 |
| 4 | 11991 |
| 5 | 18197 |
| 6 | 66075 |
| 7 | 72225 |
| 8 | 141683 |
| 9 | 1092489 |
| 10 | 3168099 |
| 11 | 6001209 |
| 12 | 6226335 |
| 13 | 6435309 |
| 14 | 12489657 |
| 15 | 17906499 |
| 16 | 50429883 |
| 17 | 51928701 |
| 18 | 68301841 |
| 19 | 295742437 |
| 20 | 390117873 |
| 21 | 542959199 |
| 22 | 554456167 |
| 23 | 566494057 |