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) |
|---|---|
| 4 | 0 |
| 5 | 0 |
| 6 | 2 |
| 7 | 10 |
| 8 | 33 |
| 9 | 101 |
| 10 | 277 |
| 11 | 754 |
| 12 | 1972 |
| 13 | 5134 |
| 14 | 13145 |
| 15 | 33563 |
| 16 | 85048 |
| 17 | 215075 |
| 18 | 541887 |
| 19 | 1363376 |
| 20 | 3423537 |
| 21 | 8588521 |
| 22 | 21522243 |
| 23 | 53898911 |
| 24 | 134895022 |
| 25 | 337467395 |
| 26 | 843924068 |
| 27 | 2109897826 |
| 28 | 5273789335 |
| 29 | 13180026621 |
| 30 | 32934865984 |