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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 2 |
| 8 | 9 |
| 9 | 37 |
| 10 | 121 |
| 11 | 331 |
| 12 | 793 |
| 13 | 1717 |
| 14 | 5149 |
| 15 | 32176 |
| 16 | 217361 |
| 17 | 1186329 |
| 18 | 5282785 |
| 19 | 20004037 |
| 20 | 66589681 |
| 21 | 266164921 |
| 22 | 2012163385 |
| 23 | 18230119678 |
| 24 | 137986473241 |
| 25 | 849028203101 |
| 26 | 4391743155801 |
| 27 | 19722685412431 |
| 28 | 98510163677641 |
| 29 | 856572597342541 |
| 30 | 9516244046786101 |