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 | 26 |
| 2 | 124 |
| 3 | 464 |
| 4 | 2032 |
| 5 | 8956 |
| 6 | 40498 |
| 7 | 185358 |
| 8 | 857352 |
| 9 | 3996572 |
| 10 | 18748294 |
| 11 | 88404078 |
| 12 | 418649134 |
| 13 | 1989796094 |
| 14 | 9486867052 |
| 15 | 45353726944 |
| 16 | 217336589784 |
| 17 | 1043666874012 |
| 18 | 5021108669734 |
| 19 | 24196986793782 |
| 20 | 116781703334762 |