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 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 55 |
| 5 | 116 |
| 6 | 6543 |
| 7 | 10847 |
| 8 | 23974 |
| 9 | 27567 |
| 10 | 76709 |
| 11 | 177975 |
| 12 | 457523 |
| 13 | 887643 |
| 14 | 1625567 |
| 15 | 2751966 |
| 16 | 3772007 |
| 17 | 9385401 |
| 18 | 42401669 |
| 19 | 61136051 |
| 20 | 301137372 |
| 21 | 2946723445 |
| 22 | 7632981296 |
| 23 | 24728168164 |
| 24 | 98261951745 |
| 25 | 99582868271 |
| 26 | 159657063059 |
| 27 | 231641062432 |
| 28 | 851793186025 |
| 29 | 870658222248 |