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 | 25 |
| 2 | 385 |
| 3 | 4651 |
| 4 | 47953 |
| 5 | 439927 |
| 6 | 3693505 |
| 7 | 29066311 |
| 8 | 219071473 |
| 9 | 1609259287 |
| 10 | 11658284065 |
| 11 | 83824687591 |
| 12 | 599858908753 |
| 13 | 4277376525367 |
| 14 | 30411820662145 |
| 15 | 215703854542471 |
| 16 | 1526853641242033 |
| 17 | 10789535445362647 |
| 18 | 76136107857549025 |