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 | 0 |
| 2 | 1 |
| 3 | 66 |
| 4 | 1348 |
| 5 | 15066 |
| 6 | 118158 |
| 7 | 731444 |
| 8 | 3813048 |
| 9 | 17413532 |
| 10 | 71497004 |
| 11 | 268726051 |
| 12 | 936836634 |
| 13 | 3059698312 |
| 14 | 9435007950 |
| 15 | 27642602449 |
| 16 | 77344108820 |
| 17 | 207567987387 |
| 18 | 536252189264 |
| 19 | 1337891704776 |
| 20 | 3232242731921 |
| 21 | 7579822554305 |
| 22 | 17290405684287 |