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 | 6 |
| 3 | 55 |
| 4 | 610 |
| 5 | 7980 |
| 6 | 120274 |
| 7 | 2052309 |
| 8 | 39110490 |
| 9 | 823324755 |
| 10 | 18974858540 |
| 11 | 475182478056 |
| 12 | 12848667150956 |
| 13 | 373081590628565 |
| 14 | 11578264139795430 |
| 15 | 382452947343624515 |
| 16 | 13397354334102974934 |
| 17 | 496082324933446766724 |
| 18 | 19360538560004548357830 |
| 19 | 794275868644522931369185 |