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 | 3 |
| 2 | 4 |
| 3 | 19 |
| 4 | 23 |
| 5 | 134 |
| 6 | 1229 |
| 7 | 2592 |
| 8 | 16781 |
| 9 | 86497 |
| 10 | 276272 |
| 11 | 1467857 |
| 12 | 12019128 |
| 13 | 109640009 |
| 14 | 779499191 |
| 15 | 7125132728 |
| 16 | 22154897375 |
| 17 | 51434927478 |
| 18 | 176459679809 |
| 19 | 1463112365950 |
| 20 | 6028909143609 |
| 21 | 37636567227604 |
| 22 | 81302043598817 |
| 23 | 525448828820506 |
| 24 | 2183097358880841 |