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 | 11 |
| 2 | 79 |
| 3 | 591 |
| 4 | 4441 |
| 5 | 33391 |
| 6 | 251077 |
| 7 | 1887941 |
| 8 | 14196143 |
| 9 | 106746189 |
| 10 | 802665137 |
| 11 | 6035544031 |
| 12 | 45383547985 |
| 13 | 341256134861 |
| 14 | 2566034493807 |
| 15 | 19294987989285 |
| 16 | 145086343307233 |
| 17 | 1090959321972847 |
| 18 | 8203337509713921 |
| 19 | 61684010524412861 |