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) |
|---|---|
| 1 | 152 |
| 2 | 4743 |
| 3 | 59008 |
| 4 | 426425 |
| 5 | 2164680 |
| 6 | 8583967 |
| 7 | 28371968 |
| 8 | 81545697 |
| 9 | 209841400 |
| 10 | 493679879 |
| 11 | 1078445952 |
| 12 | 2213497273 |
| 13 | 4308069416 |
| 14 | 8009070975 |
| 15 | 14306664448 |
| 16 | 24674505857 |
| 17 | 41252568408 |
| 18 | 67081603015 |
| 19 | 106399491200 |
| 20 | 165011023737 |