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 | 6 |
| 3 | 26 |
| 4 | 99 |
| 5 | 348 |
| 6 | 1194 |
| 7 | 4000 |
| 8 | 13326 |
| 9 | 44058 |
| 10 | 144066 |
| 11 | 462504 |
| 12 | 1459194 |
| 13 | 4545588 |
| 14 | 14068554 |
| 15 | 43450848 |
| 16 | 134213808 |
| 17 | 414692130 |
| 18 | 1280610858 |
| 19 | 3948172380 |
| 20 | 12142365042 |
| 21 | 37235047770 |
| 22 | 113844652986 |
| 23 | 347103133068 |
| 24 | 1055610536520 |
| 25 | 3202944247674 |
| 26 | 9697395164616 |
| 27 | 29298206343284 |