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) |
|---|---|
| 9 | 4 |
| 10 | 112 |
| 11 | 1615 |
| 12 | 15403 |
| 13 | 112106 |
| 14 | 672015 |
| 15 | 3477691 |
| 16 | 16037089 |
| 17 | 67235292 |
| 18 | 260887532 |
| 19 | 946435074 |
| 20 | 3246205986 |
| 21 | 10587385911 |
| 22 | 33085654876 |
| 23 | 99411959668 |
| 24 | 288773319190 |
| 25 | 812777159786 |
| 26 | 2225529375130 |
| 27 | 5937743304924 |
| 28 | 15483111029378 |
| 29 | 39503358108034 |
| 30 | 98849770060367 |
| 31 | 242801184657314 |