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 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 14 |
| 7 | 30 |
| 8 | 68 |
| 9 | 157 |
| 10 | 379 |
| 11 | 901 |
| 12 | 2229 |
| 13 | 5488 |
| 14 | 13846 |
| 15 | 34801 |
| 16 | 89368 |
| 17 | 228186 |
| 18 | 592943 |
| 19 | 1533511 |
| 20 | 4026833 |