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 | 1 |
| 2 | 7 |
| 3 | 77 |
| 4 | 987 |
| 5 | 13839 |
| 6 | 205513 |
| 7 | 3176747 |
| 8 | 50578445 |
| 9 | 823779286 |
| 10 | 13660621282 |
| 11 | 229865812134 |
| 12 | 3915003083306 |
| 13 | 67361559577578 |
| 14 | 1169138502393414 |
| 15 | 20444573270374050 |
| 16 | 359858503314494318 |
| 17 | 6370677542063831319 |
| 18 | 113359050598950194801 |
| 19 | 2026309136822686950087 |