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 | 7 |
| 2 | 49 |
| 3 | 292 |
| 4 | 1723 |
| 5 | 10327 |
| 6 | 61996 |
| 7 | 371641 |
| 8 | 2227333 |
| 9 | 13350748 |
| 10 | 80027347 |
| 11 | 479695855 |
| 12 | 2875358812 |
| 13 | 17235289777 |
| 14 | 103310698477 |
| 15 | 619258487404 |
| 16 | 3711920099323 |
| 17 | 22249757087527 |
| 18 | 133368089673676 |
| 19 | 799426585401961 |
| 20 | 4791872379016597 |