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 | 14 |
| 1 | 56 |
| 2 | 202 |
| 3 | 715 |
| 4 | 2529 |
| 5 | 8986 |
| 6 | 32123 |
| 7 | 115556 |
| 8 | 418200 |
| 9 | 1521976 |
| 10 | 5567551 |
| 11 | 20462525 |
| 12 | 75528895 |
| 13 | 279874350 |
| 14 | 1040790135 |
| 15 | 3883140600 |
| 16 | 14531382060 |
| 17 | 54529456320 |
| 18 | 205146226200 |
| 19 | 773608833894 |
| 20 | 2923686178098 |
| 21 | 11071970477876 |