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 | 34 |
| 4 | 199 |
| 5 | 1200 |
| 6 | 7388 |
| 7 | 46148 |
| 8 | 291305 |
| 9 | 1853580 |
| 10 | 11868585 |
| 11 | 76380825 |
| 12 | 493606725 |
| 13 | 3201081873 |
| 14 | 20821158233 |
| 15 | 135776966761 |
| 16 | 887393271310 |
| 17 | 5811082966885 |
| 18 | 38119865826420 |
| 19 | 250447855600320 |
| 20 | 1647729357535485 |
| 21 | 10854207824989830 |
| 22 | 71581930485576630 |