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 | 21 |
| 2 | 23 |
| 3 | 118 |
| 4 | 235 |
| 5 | 689 |
| 6 | 1784 |
| 7 | 4558 |
| 8 | 12324 |
| 9 | 32336 |
| 10 | 84536 |
| 11 | 223968 |
| 12 | 588744 |
| 13 | 1548844 |
| 14 | 4083686 |
| 15 | 10742086 |
| 16 | 28288776 |
| 17 | 74511660 |
| 18 | 196104792 |
| 19 | 516398498 |
| 20 | 1359816012 |
| 21 | 3579887214 |
| 22 | 9426059034 |
| 23 | 24819072446 |
| 24 | 65345909914 |
| 25 | 172055547718 |
| 26 | 453015967754 |