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 | 3 |
| 3 | 8 |
| 4 | 23 |
| 5 | 73 |
| 6 | 253 |
| 7 | 948 |
| 8 | 3817 |
| 9 | 16433 |
| 10 | 75295 |
| 11 | 365600 |
| 12 | 1874083 |
| 13 | 10108025 |
| 14 | 57194585 |
| 15 | 338615084 |
| 16 | 2092609701 |
| 17 | 13470059649 |
| 18 | 90137761867 |
| 19 | 625940219896 |
| 20 | 4503468629391 |
| 21 | 33520255302185 |
| 22 | 257764170849941 |
| 23 | 2045255722438180 |