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 | 1 |
| 2 | 5 |
| 3 | 26 |
| 4 | 174 |
| 5 | 1531 |
| 6 | 17275 |
| 7 | 243092 |
| 8 | 4165260 |
| 9 | 85133685 |
| 10 | 2039546785 |
| 11 | 56447550542 |
| 12 | 1783865468186 |
| 13 | 63766726231791 |
| 14 | 2558290237404919 |
| 15 | 114418196763735112 |
| 16 | 5670168958036693976 |
| 17 | 309630356618418661737 |
| 18 | 18536683645526372648445 |