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 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 19 |
| 6 | 67 |
| 7 | 331 |
| 8 | 2221 |
| 9 | 19577 |
| 10 | 219613 |
| 11 | 3042161 |
| 12 | 50728129 |
| 13 | 997525853 |
| 14 | 22742734291 |
| 15 | 592821132889 |
| 16 | 17461204521323 |
| 17 | 575411103069067 |
| 18 | 21034688742654437 |
| 19 | 846729487306354343 |