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 | 13 |
| 2 | 90 |
| 3 | 370 |
| 4 | 1403 |
| 5 | 5256 |
| 6 | 19749 |
| 7 | 74628 |
| 8 | 283551 |
| 9 | 1082440 |
| 10 | 4148594 |
| 11 | 15953598 |
| 12 | 61526960 |
| 13 | 237876562 |
| 14 | 921678867 |
| 15 | 3577968072 |
| 16 | 13913243127 |
| 17 | 54184698792 |
| 18 | 211307360862 |
| 19 | 825059443542 |
| 20 | 3225071709972 |
| 21 | 12619275028602 |
| 22 | 49423455006492 |