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 | 453 |
| 2 | 1889 |
| 3 | 7769 |
| 4 | 31465 |
| 5 | 128649 |
| 6 | 525041 |
| 7 | 2141609 |
| 8 | 8740385 |
| 9 | 35666177 |
| 10 | 145538749 |
| 11 | 593901081 |
| 12 | 2423511809 |
| 13 | 9889552885 |
| 14 | 40356071813 |
| 15 | 164679993617 |
| 16 | 672005573917 |
| 17 | 2742236755101 |
| 18 | 11190178304945 |
| 19 | 45663487141625 |
| 20 | 186337877072653 |