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 | 17 |
| 3 | 652 |
| 4 | 4700 |
| 5 | 165985 |
| 6 | 1194161 |
| 7 | 42159916 |
| 8 | 303312572 |
| 9 | 10708453057 |
| 10 | 77040199505 |
| 11 | 2719904916940 |
| 12 | 19567907362076 |
| 13 | 690845140450081 |
| 14 | 4970171429768177 |
| 15 | 175471945769404012 |
| 16 | 1262403975253755260 |
| 17 | 44569183380288169345 |
| 18 | 320645639543024068241 |
| 19 | 11320397106647425609996 |
| 20 | 81442730039952859578332 |