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 | 51 |
| 3 | 344 |
| 4 | 2402 |
| 5 | 16808 |
| 6 | 117650 |
| 7 | 823544 |
| 8 | 5764802 |
| 9 | 40353608 |
| 10 | 40353623 |
| 11 | 40354466 |
| 12 | 282475250 |
| 13 | 1977326744 |
| 14 | 1977326763 |
| 15 | 13841287202 |
| 16 | 13841287211 |
| 17 | 13841290483 |
| 18 | 96889010408 |
| 19 | 96889010409 |
| 20 | 678223072850 |
| 21 | 678223072851 |
| 22 | 678223072995 |