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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 5 |
| 7 | 6 |
| 8 | 7 |
| 9 | 21355040 |
| 10 | 21355041 |
| 11 | 21355042 |
| 12 | 21355043 |
| 13 | 21355044 |
| 14 | 21355045 |
| 15 | 21355046 |
| 16 | 21355047 |
| 17 | 5406016340533523126 |
| 18 | 5406016341275264235 |
| 19 | 5406016341324744317 |
| 20 | 5406016341324744320 |
| 21 | 5406016341325061711 |
| 22 | 5406016341325061712 |
| 23 | 5406016342066514511 |