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 | 1 |
| 2 | 4 |
| 3 | 22 |
| 4 | 107 |
| 5 | 471 |
| 6 | 1842 |
| 7 | 6575 |
| 8 | 21713 |
| 9 | 67105 |
| 10 | 195760 |
| 11 | 543050 |
| 12 | 1440869 |
| 13 | 3674381 |
| 14 | 9042422 |
| 15 | 21548644 |
| 16 | 49872800 |
| 17 | 112387351 |
| 18 | 247136196 |
| 19 | 531320447 |
| 20 | 1118701390 |
| 21 | 2310261518 |
| 22 | 4685733808 |
| 23 | 9345070552 |
| 24 | 18346037917 |
| 25 | 35487652677 |
| 26 | 67696833402 |