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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 10 |
| 5 | 23 |
| 6 | 51 |
| 7 | 128 |
| 8 | 386 |
| 9 | 1092 |
| 10 | 3370 |
| 11 | 12458 |
| 12 | 43037 |
| 13 | 158638 |
| 14 | 691999 |
| 15 | 2827035 |
| 16 | 12150430 |
| 17 | 60980759 |
| 18 | 287737037 |
| 19 | 1414689552 |
| 20 | 8021603122 |
| 21 | 42939104470 |
| 22 | 237864297110 |
| 23 | 1502870474645 |
| 24 | 8999347646633 |
| 25 | 55484973357830 |