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 | 7 |
| 1 | 44 |
| 2 | 272 |
| 3 | 1677 |
| 4 | 10335 |
| 5 | 63688 |
| 6 | 392464 |
| 7 | 2418473 |
| 8 | 14903303 |
| 9 | 91838292 |
| 10 | 565933056 |
| 11 | 3487436629 |
| 12 | 21490552831 |
| 13 | 132430753616 |
| 14 | 816075074528 |
| 15 | 5028881200785 |
| 16 | 30989362279239 |
| 17 | 190965054876220 |
| 18 | 1176779691536560 |
| 19 | 7251643204095581 |