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 | 4 |
| 3 | 52 |
| 4 | 169 |
| 5 | 1993 |
| 6 | 6436 |
| 7 | 75700 |
| 8 | 244417 |
| 9 | 2874625 |
| 10 | 9281428 |
| 11 | 109160068 |
| 12 | 352449865 |
| 13 | 4145207977 |
| 14 | 13383813460 |
| 15 | 157408743076 |
| 16 | 508232461633 |
| 17 | 5977387028929 |
| 18 | 19299449728612 |
| 19 | 226983298356244 |
| 20 | 732870857225641 |
| 21 | 8619387950508361 |
| 22 | 27829793124845764 |