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 | 2 |
| 2 | 8 |
| 3 | 39 |
| 4 | 261 |
| 5 | 2090 |
| 6 | 18808 |
| 7 | 175180 |
| 8 | 1595005 |
| 9 | 13720886 |
| 10 | 109830369 |
| 11 | 814603355 |
| 12 | 5605474331 |
| 13 | 35922351069 |
| 14 | 215377645103 |
| 15 | 1213816837380 |
| 16 | 6458765687442 |
| 17 | 32580784869691 |
| 18 | 156385330035183 |
| 19 | 716642920656832 |