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 | 42 |
| 1 | 90 |
| 2 | 255 |
| 3 | 785 |
| 4 | 2529 |
| 5 | 8398 |
| 6 | 28511 |
| 7 | 98462 |
| 8 | 344720 |
| 9 | 1220532 |
| 10 | 4362438 |
| 11 | 15718149 |
| 12 | 57028063 |
| 13 | 208164950 |
| 14 | 763915215 |
| 15 | 2816707650 |
| 16 | 10429892340 |
| 17 | 38768134380 |
| 18 | 144600329250 |
| 19 | 541036998090 |
| 20 | 2030157909234 |
| 21 | 7637910332556 |