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 | 5 |
| 3 | 14 |
| 4 | 38 |
| 5 | 104 |
| 6 | 284 |
| 7 | 776 |
| 8 | 2120 |
| 9 | 5792 |
| 10 | 15824 |
| 11 | 43232 |
| 12 | 118112 |
| 13 | 322688 |
| 14 | 881600 |
| 15 | 2408576 |
| 16 | 6580352 |
| 17 | 17977856 |
| 18 | 49116416 |
| 19 | 134188544 |
| 20 | 366609920 |
| 21 | 1001596928 |
| 22 | 2736413696 |
| 23 | 7476021248 |
| 24 | 20424869888 |
| 25 | 55801782272 |
| 26 | 152453304320 |