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 | 239 |
| 3 | 2519 |
| 4 | 24135 |
| 5 | 218343 |
| 6 | 1903783 |
| 7 | 16194343 |
| 8 | 135426599 |
| 9 | 1118993447 |
| 10 | 9166829607 |
| 11 | 74629521447 |
| 12 | 604827848743 |
| 13 | 4885462331431 |
| 14 | 39365093814311 |
| 15 | 316610553147431 |
| 16 | 2543028967600167 |
| 17 | 20405121901817895 |