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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 31 |
| 6 | 89 |
| 7 | 259 |
| 8 | 842 |
| 9 | 2810 |
| 10 | 10020 |
| 11 | 37266 |
| 12 | 145373 |
| 13 | 586071 |
| 14 | 2453927 |
| 15 | 10590180 |
| 16 | 47159351 |
| 17 | 215706629 |
| 18 | 1013916313 |
| 19 | 4882544468 |
| 20 | 24087770591 |
| 21 | 121481296510 |
| 22 | 626169893024 |
| 23 | 3293432146879 |
| 24 | 17670096206819 |
| 25 | 96589760733604 |
| 26 | 537731396393480 |
| 27 | 3045955783377644 |