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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 4 |
| 5 | 11 |
| 6 | 36 |
| 7 | 82 |
| 8 | 239 |
| 9 | 821 |
| 10 | 3742 |
| 11 | 10328 |
| 12 | 42934 |
| 13 | 156070 |
| 14 | 729249 |
| 15 | 4025361 |
| 16 | 15032099 |
| 17 | 68746675 |
| 18 | 334541624 |
| 19 | 1645575386 |
| 20 | 9104991312 |
| 21 | 65010298257 |
| 22 | 282768687257 |
| 23 | 1616844660914 |
| 24 | 8660050947383 |
| 25 | 53262316928024 |
| 26 | 309119883729116 |
| 27 | 2185141720645817 |