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 | 7 |
| 2 | 34 |
| 3 | 159 |
| 4 | 788 |
| 5 | 4117 |
| 6 | 22143 |
| 7 | 121079 |
| 8 | 670811 |
| 9 | 3764758 |
| 10 | 21408813 |
| 11 | 123367344 |
| 12 | 720303998 |
| 13 | 4260491461 |
| 14 | 25523584313 |
| 15 | 154835572102 |
| 16 | 950950450917 |
| 17 | 5911757419002 |
| 18 | 37193168793829 |
| 19 | 236764641742504 |
| 20 | 1524754216743136 |