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 | 2 |
| 1 | 7 |
| 2 | 53 |
| 3 | 347 |
| 4 | 2411 |
| 5 | 16811 |
| 6 | 117659 |
| 7 | 823547 |
| 8 | 5764817 |
| 9 | 40353611 |
| 10 | 282475267 |
| 11 | 1977326753 |
| 12 | 13841287217 |
| 13 | 96889010447 |
| 14 | 678223072853 |
| 15 | 4747561510009 |
| 16 | 33232930569607 |
| 17 | 232630513987231 |
| 18 | 1628413597910497 |
| 19 | 11398895185373167 |