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 | 1 |
| 3 | 5 |
| 4 | 10 |
| 5 | 26 |
| 6 | 85 |
| 7 | 170 |
| 8 | 500 |
| 9 | 1450 |
| 10 | 3172 |
| 11 | 7922 |
| 12 | 31031 |
| 13 | 54290 |
| 14 | 143140 |
| 15 | 483860 |
| 16 | 1105000 |
| 17 | 2550410 |
| 18 | 8923300 |
| 19 | 17494900 |
| 20 | 53353040 |
| 21 | 150655700 |
| 22 | 313727044 |
| 23 | 821223650 |
| 24 | 3291697500 |
| 25 | 5862907302 |
| 26 | 14736586180 |
| 27 | 48413209000 |
| 28 | 113026206800 |