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 | 2 |
| 3 | 7 |
| 4 | 219 |
| 5 | 226 |
| 6 | 32989 |
| 7 | 33215 |
| 8 | 165849 |
| 9 | 364913 |
| 10 | 3085153 |
| 11 | 3450066 |
| 12 | 23785549 |
| 13 | 27235615 |
| 14 | 78256779 |
| 15 | 262005952 |
| 16 | 340262731 |
| 17 | 1623056876 |
| 18 | 1963319607 |
| 19 | 11439654911 |
| 20 | 13402974518 |
| 21 | 560961610149 |
| 22 | 574364584667 |
| 23 | 1709690779483 |