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 | 12 |
| 4 | 31 |
| 5 | 78 |
| 6 | 225 |
| 7 | 733 |
| 8 | 2305 |
| 9 | 7156 |
| 10 | 22388 |
| 11 | 70737 |
| 12 | 223576 |
| 13 | 705927 |
| 14 | 2229237 |
| 15 | 7044181 |
| 16 | 22263130 |
| 17 | 70360408 |
| 18 | 222365159 |
| 19 | 702781362 |
| 20 | 2221173901 |
| 21 | 7020142785 |
| 22 | 22187534409 |
| 23 | 70124998492 |
| 24 | 221634512416 |
| 25 | 700490315089 |
| 26 | 2213945357924 |