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) |
|---|---|
| 2 | 7 |
| 3 | 52 |
| 4 | 231 |
| 5 | 806 |
| 6 | 2451 |
| 7 | 6840 |
| 8 | 18031 |
| 9 | 45682 |
| 10 | 112443 |
| 11 | 270788 |
| 12 | 641031 |
| 13 | 1496574 |
| 14 | 3453859 |
| 15 | 7893232 |
| 16 | 17886687 |
| 17 | 40233578 |
| 18 | 89908875 |
| 19 | 199746108 |
| 20 | 441441655 |
| 21 | 970971190 |
| 22 | 2126500467 |
| 23 | 4638886952 |
| 24 | 10083091791 |
| 25 | 21843918306 |
| 26 | 47177512411 |
| 27 | 101602798900 |
| 28 | 218238002151 |
| 29 | 467614538222 |