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 | 49 |
| 2 | 1224 |
| 3 | 20776 |
| 4 | 269499 |
| 5 | 2848811 |
| 6 | 25555215 |
| 7 | 200037215 |
| 8 | 1394396185 |
| 9 | 8790665065 |
| 10 | 50733161116 |
| 11 | 270672378844 |
| 12 | 1345758869770 |
| 13 | 6277354061930 |
| 14 | 27627446293371 |
| 15 | 115285643098059 |
| 16 | 458048619713020 |
| 17 | 1739199358769180 |