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 | 10 |
| 2 | 20 |
| 3 | 80 |
| 4 | 100 |
| 5 | 460 |
| 6 | 620 |
| 7 | 2780 |
| 8 | 3700 |
| 9 | 16660 |
| 10 | 22220 |
| 11 | 99980 |
| 12 | 133300 |
| 13 | 599860 |
| 14 | 799820 |
| 15 | 3599180 |
| 16 | 4798900 |
| 17 | 21595060 |
| 18 | 28793420 |
| 19 | 129570380 |
| 20 | 172760500 |
| 21 | 777422260 |
| 22 | 1036563020 |
| 23 | 4664533580 |
| 24 | 6219378100 |
| 25 | 27987201460 |
| 26 | 37316268620 |
| 27 | 167923208780 |
| 28 | 223897611700 |
| 29 | 1007539252660 |
| 30 | 1343385670220 |
| 31 | 6045235515980 |