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 | 19 |
| 2 | 277 |
| 3 | 3667 |
| 4 | 46405 |
| 5 | 573667 |
| 6 | 7001653 |
| 7 | 84843379 |
| 8 | 1023885349 |
| 9 | 12326977795 |
| 10 | 148206208789 |
| 11 | 1780451832211 |
| 12 | 21379263273733 |
| 13 | 256648048295203 |
| 14 | 3080454802615285 |
| 15 | 36970205192893363 |
| 16 | 443675695245289957 |