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 | 3 |
| 3 | 11 |
| 4 | 21 |
| 5 | 61 |
| 6 | 111 |
| 7 | 309 |
| 8 | 565 |
| 9 | 1563 |
| 10 | 2859 |
| 11 | 7907 |
| 12 | 14459 |
| 13 | 39991 |
| 14 | 73117 |
| 15 | 202227 |
| 16 | 369729 |
| 17 | 1022587 |
| 18 | 1869581 |
| 19 | 5170829 |
| 20 | 9453757 |
| 21 | 26146909 |
| 22 | 47804041 |
| 23 | 132214959 |
| 24 | 241726811 |
| 25 | 668560673 |
| 26 | 1222320359 |
| 27 | 3380656559 |
| 28 | 6180808253 |
| 29 | 17094691953 |
| 30 | 31253992007 |
| 31 | 86441342981 |