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 | 15 |
| 3 | 85 |
| 4 | 259 |
| 5 | 1111 |
| 6 | 4369 |
| 7 | 47989 |
| 8 | 65641 |
| 9 | 291919 |
| 10 | 2016379 |
| 11 | 2214031 |
| 12 | 3397651 |
| 13 | 3820909 |
| 14 | 5864581 |
| 15 | 9305311 |
| 16 | 13881841 |
| 17 | 15687751 |
| 18 | 16843009 |
| 19 | 19756171 |
| 20 | 22030681 |
| 21 | 28746559 |
| 22 | 62256349 |
| 23 | 64160401 |
| 24 | 74264821 |
| 25 | 79692331 |
| 26 | 101412319 |
| 27 | 117889591 |
| 28 | 172189309 |
| 29 | 185518471 |
| 30 | 191435329 |