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 | 11 |
| 2 | 309 |
| 3 | 16687 |
| 4 | 1468457 |
| 5 | 190899411 |
| 6 | 34361893981 |
| 7 | 8178130767479 |
| 8 | 2486151753313617 |
| 9 | 939765362752547227 |
| 10 | 432292066866171724421 |
| 11 | 237760636776394448431551 |
| 12 | 154068892631103602583645049 |