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 | 2 |
| 3 | 11 |
| 4 | 40 |
| 5 | 123 |
| 6 | 349 |
| 7 | 951 |
| 8 | 2539 |
| 9 | 6710 |
| 10 | 17645 |
| 11 | 46290 |
| 12 | 121302 |
| 13 | 317706 |
| 14 | 831920 |
| 15 | 2178173 |
| 16 | 5702734 |
| 17 | 14930181 |
| 18 | 39087979 |
| 19 | 102333945 |
| 20 | 267914065 |
| 21 | 701408480 |
| 22 | 1836311627 |
| 23 | 4807526676 |
| 24 | 12586268700 |
| 25 | 32951279748 |
| 26 | 86267570894 |
| 27 | 225851433311 |