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 | 6 |
| 2 | 20 |
| 3 | 58 |
| 4 | 161 |
| 5 | 436 |
| 6 | 1165 |
| 7 | 3088 |
| 8 | 8146 |
| 9 | 21426 |
| 10 | 56255 |
| 11 | 147538 |
| 12 | 386681 |
| 13 | 1013026 |
| 14 | 2653240 |
| 15 | 6948058 |
| 16 | 18193141 |
| 17 | 47634936 |
| 18 | 124717445 |
| 19 | 326526748 |
| 20 | 854877926 |
| 21 | 2238131506 |
| 22 | 5859556195 |
| 23 | 15340601158 |
| 24 | 40162350961 |
| 25 | 105146619486 |
| 26 | 275277778940 |