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 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 42 |
| 5 | 84 |
| 6 | 2730 |
| 7 | 5460 |
| 8 | 21864 |
| 9 | 174762 |
| 10 | 349524 |
| 11 | 8575060 |
| 12 | 11184810 |
| 13 | 89478504 |
| 14 | 106502227 |
| 15 | 109295017 |
| 16 | 181276927 |
| 17 | 181843540 |
| 18 | 184069717 |
| 19 | 223830100 |
| 20 | 245705471 |
| 21 | 279956051 |
| 22 | 280652201 |
| 23 | 287571966 |
| 24 | 291006547 |
| 25 | 316295081 |
| 26 | 316991231 |
| 27 | 358660180 |
| 28 | 360195667 |
| 29 | 362988457 |
| 30 | 422527571 |