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 | 1 |
| 2 | 4 |
| 3 | 13 |
| 4 | 40 |
| 5 | 124 |
| 6 | 394 |
| 7 | 1285 |
| 8 | 4288 |
| 9 | 14584 |
| 10 | 50386 |
| 11 | 176356 |
| 12 | 624034 |
| 13 | 2228698 |
| 14 | 8023318 |
| 15 | 29084533 |
| 16 | 106073008 |
| 17 | 388934368 |
| 18 | 1432916098 |
| 19 | 5301789568 |
| 20 | 19692361258 |
| 21 | 73398801058 |
| 22 | 274447690918 |
| 23 | 1029178840948 |
| 24 | 3869712441970 |
| 25 | 14585839204354 |