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 | 10 |
| 2 | 50 |
| 3 | 212 |
| 4 | 823 |
| 5 | 3030 |
| 6 | 10777 |
| 7 | 37530 |
| 8 | 128742 |
| 9 | 437110 |
| 10 | 1472736 |
| 11 | 4933374 |
| 12 | 16449879 |
| 13 | 54649472 |
| 14 | 181008926 |
| 15 | 598052300 |
| 16 | 1971884632 |
| 17 | 6490418396 |
| 18 | 21331768570 |
| 19 | 70022479666 |
| 20 | 229604183052 |
| 21 | 752170525867 |
| 22 | 2462061236121 |
| 23 | 8053252606139 |