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 | 7 |
| 2 | 49 |
| 3 | 174 |
| 4 | 840 |
| 5 | 3858 |
| 6 | 17460 |
| 7 | 80070 |
| 8 | 365784 |
| 9 | 1670838 |
| 10 | 7636416 |
| 11 | 34893438 |
| 12 | 159444240 |
| 13 | 728589330 |
| 14 | 3329288484 |
| 15 | 15213221238 |
| 16 | 69517022592 |
| 17 | 317658800982 |
| 18 | 1451545657152 |
| 19 | 6632855083422 |
| 20 | 30308909178984 |
| 21 | 138496917825186 |
| 22 | 632863297956804 |