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 | 2 |
| 2 | 13 |
| 3 | 66 |
| 4 | 286 |
| 5 | 1102 |
| 6 | 3879 |
| 7 | 12688 |
| 8 | 39050 |
| 9 | 114114 |
| 10 | 318863 |
| 11 | 856654 |
| 12 | 2222688 |
| 13 | 5589916 |
| 14 | 13668072 |
| 15 | 32576016 |
| 16 | 75845402 |
| 17 | 172830788 |
| 18 | 386088741 |
| 19 | 846744800 |
| 20 | 1825447086 |
| 21 | 3872819904 |
| 22 | 8094022001 |
| 23 | 16679126516 |
| 24 | 33916289400 |
| 25 | 68106769602 |
| 26 | 135148379654 |
| 27 | 265177195950 |