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 | 4 |
| 2 | 22 |
| 3 | 86 |
| 4 | 92 |
| 5 | 292 |
| 6 | 904 |
| 7 | 1515 |
| 8 | 1975 |
| 9 | 4933 |
| 10 | 19252 |
| 11 | 23400 |
| 12 | 28026 |
| 13 | 43044 |
| 14 | 48399 |
| 15 | 82292 |
| 16 | 238773 |
| 17 | 18642549 |
| 18 | 28116059 |
| 19 | 47720584 |
| 20 | 1582947265 |
| 21 | 1616934502 |
| 22 | 17082390754 |
| 23 | 98630202120 |
| 24 | 163918621174 |
| 25 | 736646478316 |
| 26 | 2914782808490 |
| 27 | 33024950541229 |
| 28 | 104502070935393 |
| 29 | 595094589759096 |