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 | 17 |
| 4 | 74 |
| 5 | 282 |
| 6 | 985 |
| 7 | 3142 |
| 8 | 9353 |
| 9 | 26146 |
| 10 | 69331 |
| 11 | 175410 |
| 12 | 426006 |
| 13 | 997336 |
| 14 | 2259816 |
| 15 | 4971190 |
| 16 | 10646876 |
| 17 | 22251915 |
| 18 | 45477519 |
| 19 | 91049794 |
| 20 | 178855119 |
| 21 | 345194427 |
| 22 | 655396606 |
| 23 | 1225461491 |
| 24 | 2258813924 |
| 25 | 4108018840 |
| 26 | 7377439511 |
| 27 | 13092332036 |