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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 31 |
| 5 | 163 |
| 6 | 979 |
| 7 | 6556 |
| 8 | 48150 |
| 9 | 383219 |
| 10 | 3275121 |
| 11 | 29841176 |
| 12 | 288196506 |
| 13 | 2936030427 |
| 14 | 31425237185 |
| 15 | 352166075233 |
| 16 | 4119800015129 |
| 17 | 50180781755797 |
| 18 | 634948818421481 |
| 19 | 8329111076372852 |
| 20 | 113065244341635514 |
| 21 | 1585699911447149109 |
| 22 | 22942071009006046159 |