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 | 10 |
| 2 | 100 |
| 3 | 350 |
| 4 | 1271 |
| 5 | 5594 |
| 6 | 25490 |
| 7 | 121313 |
| 8 | 584386 |
| 9 | 2841676 |
| 10 | 13864995 |
| 11 | 67793828 |
| 12 | 331778574 |
| 13 | 1624527917 |
| 14 | 7956223332 |
| 15 | 38970988538 |
| 16 | 190898358977 |
| 17 | 935140523244 |
| 18 | 4580980652676 |
| 19 | 22441074230301 |
| 20 | 109933649821120 |
| 21 | 538540783077848 |