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 | 14 |
| 3 | 93 |
| 4 | 590 |
| 5 | 3710 |
| 6 | 23509 |
| 7 | 148796 |
| 8 | 940916 |
| 9 | 5952243 |
| 10 | 37655502 |
| 11 | 238204978 |
| 12 | 1506870209 |
| 13 | 9532433288 |
| 14 | 60301864000 |
| 15 | 381467462217 |
| 16 | 2413150656124 |
| 17 | 15265511608858 |
| 18 | 96569119066667 |
| 19 | 610893045560410 |
| 20 | 3864489168524208 |
| 21 | 24446630393071735 |
| 22 | 154648573589573678 |