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 | 6 |
| 4 | 19 |
| 5 | 67 |
| 6 | 241 |
| 7 | 901 |
| 8 | 3398 |
| 9 | 12991 |
| 10 | 49958 |
| 11 | 193317 |
| 12 | 751080 |
| 13 | 2928956 |
| 14 | 11455059 |
| 15 | 44916219 |
| 16 | 176506797 |
| 17 | 694970938 |
| 18 | 2741058805 |
| 19 | 10827790934 |
| 20 | 42831461499 |
| 21 | 169641003412 |
| 22 | 672657627655 |
| 23 | 2669991663529 |
| 24 | 10608177653227 |
| 25 | 42184582641002 |