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 | 3 |
| 2 | 21 |
| 3 | 72 |
| 4 | 329 |
| 5 | 1353 |
| 6 | 5796 |
| 7 | 24447 |
| 8 | 103729 |
| 9 | 439128 |
| 10 | 1860621 |
| 11 | 7880997 |
| 12 | 33385604 |
| 13 | 141421803 |
| 14 | 599075421 |
| 15 | 2537719272 |
| 16 | 10749959329 |
| 17 | 45537545553 |
| 18 | 192900159396 |
| 19 | 817138154247 |
| 20 | 3461452823129 |
| 21 | 14662949371128 |
| 22 | 62113250430021 |