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 | 25 |
| 5 | 67 |
| 6 | 172 |
| 7 | 448 |
| 8 | 1165 |
| 9 | 3025 |
| 10 | 7864 |
| 11 | 20434 |
| 12 | 53101 |
| 13 | 137995 |
| 14 | 358600 |
| 15 | 931888 |
| 16 | 2421673 |
| 17 | 6293137 |
| 18 | 16353820 |
| 19 | 42498250 |
| 20 | 110439121 |
| 21 | 286995331 |
| 22 | 745807444 |
| 23 | 1938110800 |
| 24 | 5036519125 |
| 25 | 13088273857 |
| 26 | 34012163632 |
| 27 | 88386542578 |