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 | 1 |
| 2 | 3 |
| 3 | 11 |
| 4 | 46 |
| 5 | 207 |
| 6 | 977 |
| 7 | 4769 |
| 8 | 23872 |
| 9 | 121862 |
| 10 | 631958 |
| 11 | 3319923 |
| 12 | 17630692 |
| 13 | 94493713 |
| 14 | 510468519 |
| 15 | 2776629563 |
| 16 | 15194389388 |
| 17 | 83591476528 |
| 18 | 462062822648 |
| 19 | 2564995473974 |
| 20 | 14293435176216 |
| 21 | 79927207249606 |
| 22 | 448358398361618 |
| 23 | 2522381161938591 |
| 24 | 14228119729773226 |