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 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | 76 |
| 4 | 430 |
| 5 | 1870 |
| 6 | 6601 |
| 7 | 19810 |
| 8 | 52326 |
| 9 | 124785 |
| 10 | 273790 |
| 11 | 560626 |
| 12 | 1083160 |
| 13 | 1991626 |
| 14 | 3509065 |
| 15 | 5957260 |
| 16 | 9789076 |
| 17 | 15628185 |
| 18 | 24317226 |
| 19 | 36975520 |
| 20 | 55067530 |
| 21 | 80483326 |
| 22 | 115632385 |
| 23 | 163552126 |
| 24 | 228032650 |
| 25 | 313759225 |
| 26 | 426474126 |
| 27 | 573159510 |