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 | 2 |
| 3 | 10 |
| 4 | 84 |
| 5 | 1301 |
| 6 | 15693 |
| 7 | 376762 |
| 8 | 6168552 |
| 9 | 176787631 |
| 10 | 3770427352 |
| 11 | 142364319626 |
| 12 | 3152758480715 |
| 13 | 154718778284149 |
| 14 | 4340093860950619 |
| 15 | 210971170836848270 |
| 16 | 7281694486114555088 |
| 17 | 435659030617933827137 |
| 18 | 14181121059071691716406 |
| 19 | 1052864393300587929716722 |
| 20 | 41673907052879908244100770 |