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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 24 |
| 5 | 97 |
| 6 | 412 |
| 7 | 1969 |
| 8 | 9898 |
| 9 | 54461 |
| 10 | 313944 |
| 11 | 1947613 |
| 12 | 12603100 |
| 13 | 86760255 |
| 14 | 620559230 |
| 15 | 4682462777 |
| 16 | 36586620348 |
| 17 | 299664171115 |
| 18 | 2534306825064 |
| 19 | 22355119509231 |
| 20 | 203115201624030 |
| 21 | 1917124624702475 |
| 22 | 18598998656476220 |
| 23 | 186822424157036439 |
| 24 | 1925326063016510832 |