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 | 6 |
| 2 | 26 |
| 3 | 114 |
| 4 | 500 |
| 5 | 2194 |
| 6 | 9628 |
| 7 | 42252 |
| 8 | 185422 |
| 9 | 813722 |
| 10 | 3571010 |
| 11 | 15671340 |
| 12 | 68773514 |
| 13 | 301811860 |
| 14 | 1324498252 |
| 15 | 5812546998 |
| 16 | 25508302906 |
| 17 | 111942925778 |
| 18 | 491260382084 |
| 19 | 2155891150146 |
| 20 | 9461106209228 |
| 21 | 41519967599596 |
| 22 | 182209952129086 |
| 23 | 799626506818554 |
| 24 | 3509152727035810 |