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 | 7 |
| 2 | 35 |
| 3 | 259 |
| 4 | 1211 |
| 5 | 9667 |
| 6 | 41195 |
| 7 | 364819 |
| 8 | 1365371 |
| 9 | 13957027 |
| 10 | 43388555 |
| 11 | 542806579 |
| 12 | 1279512731 |
| 13 | 21518363587 |
| 14 | 32221171115 |
| 15 | 871550099539 |
| 16 | 481739087291 |
| 17 | 36123365093347 |
| 18 | -15890323427125 |
| 19 | 1533071657347699 |
| 20 | -2200465241286949 |