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 | 9 |
| 2 | 81 |
| 3 | 166 |
| 4 | 436 |
| 5 | 964 |
| 6 | 2132 |
| 7 | 4846 |
| 8 | 11301 |
| 9 | 25496 |
| 10 | 57407 |
| 11 | 131250 |
| 12 | 299913 |
| 13 | 680860 |
| 14 | 1542076 |
| 15 | 3516426 |
| 16 | 8019977 |
| 17 | 18194846 |
| 18 | 41334779 |
| 19 | 94226716 |
| 20 | 214384000 |
| 21 | 486836482 |
| 22 | 1107706812 |
| 23 | 2522185912 |
| 24 | 5733889814 |
| 25 | 13035303238 |
| 26 | 29665346161 |
| 27 | 67490142684 |