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 | 14 |
| 2 | 196 |
| 3 | 474 |
| 4 | 2774 |
| 5 | 13902 |
| 6 | 55752 |
| 7 | 284272 |
| 8 | 1391724 |
| 9 | 6009486 |
| 10 | 29516206 |
| 11 | 141874800 |
| 12 | 636402740 |
| 13 | 3067035968 |
| 14 | 14596375694 |
| 15 | 66837402334 |
| 16 | 318789501330 |
| 17 | 1508938808590 |
| 18 | 6989272916424 |
| 19 | 33140915653520 |
| 20 | 156401252966536 |
| 21 | 729155025679178 |