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 | 32 |
| 2 | 154 |
| 3 | 750 |
| 4 | 3668 |
| 5 | 17986 |
| 6 | 88348 |
| 7 | 434524 |
| 8 | 2139230 |
| 9 | 10540030 |
| 10 | 51964360 |
| 11 | 256332260 |
| 12 | 1265027930 |
| 13 | 6245522700 |
| 14 | 30845183058 |
| 15 | 152383470186 |
| 16 | 753018119972 |
| 17 | 3722010001906 |
| 18 | 18401089523298 |
| 19 | 90990129769076 |
| 20 | 450009665618408 |