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 | 2 |
| 2 | 11 |
| 3 | 34 |
| 4 | 138 |
| 5 | 492 |
| 6 | 2342 |
| 7 | 8500 |
| 8 | 39814 |
| 9 | 148124 |
| 10 | 709266 |
| 11 | 2665932 |
| 12 | 12824196 |
| 13 | 48623448 |
| 14 | 235400988 |
| 15 | 897705096 |
| 16 | 4362689862 |
| 17 | 16713200556 |
| 18 | 81488683874 |
| 19 | 313281535180 |
| 20 | 1531312911148 |
| 21 | 5903966489576 |
| 22 | 28918583700468 |
| 23 | 111757786454424 |
| 24 | 548352142452124 |
| 25 | 2123323536391448 |