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 | 2 |
| 2 | 7 |
| 3 | 26 |
| 4 | 107 |
| 5 | 462 |
| 6 | 2065 |
| 7 | 9438 |
| 8 | 43811 |
| 9 | 205622 |
| 10 | 972917 |
| 11 | 4631838 |
| 12 | 22157525 |
| 13 | 106406978 |
| 14 | 512629551 |
| 15 | 2476289106 |
| 16 | 11989326771 |
| 17 | 58163714118 |
| 18 | 282662269717 |
| 19 | 1375801775214 |
| 20 | 6705710840657 |
| 21 | 32724623955882 |
| 22 | 159880046446611 |