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) |
|---|---|
| 2 | 25 |
| 3 | 69 |
| 4 | 234 |
| 5 | 678 |
| 6 | 2051 |
| 7 | 5349 |
| 8 | 15118 |
| 9 | 41014 |
| 10 | 110657 |
| 11 | 305655 |
| 12 | 823646 |
| 13 | 2219386 |
| 14 | 6034071 |
| 15 | 16316797 |
| 16 | 44240660 |
| 17 | 119845770 |
| 18 | 324311229 |
| 19 | 879921169 |
| 20 | 2385656018 |
| 21 | 6467086046 |
| 22 | 17541630385 |
| 23 | 47581555131 |
| 24 | 129104931215 |
| 25 | 350330768077 |
| 26 | 950772203169 |
| 27 | 2580621278375 |
| 28 | 7005302328953 |