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 | 3 |
| 3 | 13 |
| 4 | 85 |
| 5 | 801 |
| 6 | 10231 |
| 7 | 168253 |
| 8 | 3437673 |
| 9 | 85162465 |
| 10 | 2511412651 |
| 11 | 86805640461 |
| 12 | 3469622549053 |
| 13 | 158523442439233 |
| 14 | 8198514736542495 |
| 15 | 476003264246418301 |
| 16 | 30804251925861439441 |
| 17 | 2207978115389469465153 |
| 18 | 174304316334466458575443 |