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 | 12 |
| 2 | 34 |
| 3 | 78 |
| 4 | 206 |
| 5 | 542 |
| 6 | 1468 |
| 7 | 4016 |
| 8 | 11110 |
| 9 | 30966 |
| 10 | 86864 |
| 11 | 244916 |
| 12 | 693536 |
| 13 | 1971072 |
| 14 | 5619466 |
| 15 | 16064438 |
| 16 | 46032790 |
| 17 | 132184022 |
| 18 | 380276272 |
| 19 | 1095828356 |
| 20 | 3162539596 |
| 21 | 9139382876 |
| 22 | 26444232046 |
| 23 | 76600376186 |
| 24 | 222113604712 |
| 25 | 644654567192 |