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 | 10 |
| 3 | 51 |
| 4 | 212 |
| 5 | 805 |
| 6 | 2910 |
| 7 | 10199 |
| 8 | 34984 |
| 9 | 118089 |
| 10 | 393650 |
| 11 | 1299067 |
| 12 | 4251516 |
| 13 | 13817453 |
| 14 | 44641030 |
| 15 | 143489055 |
| 16 | 459165008 |
| 17 | 1463588497 |
| 18 | 4649045850 |
| 19 | 14721978563 |
| 20 | 46490458660 |
| 21 | 146444944821 |
| 22 | 460255540910 |
| 23 | 1443528741991 |
| 24 | 4518872583672 |