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 | 0 |
| 2 | 5 |
| 3 | 17 |
| 4 | 41 |
| 5 | 160 |
| 6 | 501 |
| 7 | 1720 |
| 8 | 6081 |
| 9 | 22548 |
| 10 | 80189 |
| 11 | 289176 |
| 12 | 1070091 |
| 13 | 3908641 |
| 14 | 14584641 |
| 15 | 54056763 |
| 16 | 202288087 |
| 17 | 761593692 |
| 18 | 2867816043 |
| 19 | 10862883985 |
| 20 | 41162256126 |
| 21 | 156592635694 |
| 22 | 596946687124 |
| 23 | 2280311678414 |
| 24 | 8729068693022 |