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 | 3 |
| 3 | 8 |
| 4 | 33 |
| 5 | 112 |
| 6 | 370 |
| 7 | 1186 |
| 8 | 4338 |
| 9 | 14999 |
| 10 | 52175 |
| 11 | 179159 |
| 12 | 649132 |
| 13 | 2415766 |
| 14 | 8994203 |
| 15 | 33305573 |
| 16 | 120968991 |
| 17 | 431067336 |
| 18 | 1538631892 |
| 19 | 5509192918 |
| 20 | 19859364136 |
| 21 | 72330631743 |
| 22 | 265219210010 |
| 23 | 977508697125 |
| 24 | 3619996788047 |
| 25 | 13376125657317 |
| 26 | 49294003078858 |
| 27 | 181671504803323 |