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 | 21 |
| 2 | 64 |
| 3 | 19 |
| 4 | 359 |
| 5 | 3089 |
| 6 | 13646 |
| 7 | 167131 |
| 8 | 1179926 |
| 9 | 7203918 |
| 10 | 75245386 |
| 11 | 508116867 |
| 12 | 3750027371 |
| 13 | 34007995888 |
| 14 | 237070967056 |
| 15 | 1896875784101 |
| 16 | 15835534124727 |
| 17 | 116172506766693 |
| 18 | 951502244265963 |
| 19 | 7649922105057405 |
| 20 | 58629569564622365 |