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 | 4 |
| 3 | 10 |
| 4 | 27 |
| 5 | 102 |
| 6 | 345 |
| 7 | 1162 |
| 8 | 4072 |
| 9 | 14224 |
| 10 | 49604 |
| 11 | 173594 |
| 12 | 607485 |
| 13 | 2125150 |
| 14 | 7436416 |
| 15 | 26022865 |
| 16 | 91060814 |
| 17 | 318652127 |
| 18 | 1115077417 |
| 19 | 3902040209 |
| 20 | 13654599697 |
| 21 | 47782246634 |
| 22 | 167206840944 |
| 23 | 585115414586 |
| 24 | 2047524354146 |
| 25 | 7165006769433 |