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 | 5 |
| 2 | 39 |
| 3 | 175 |
| 4 | 618 |
| 5 | 1764 |
| 6 | 4420 |
| 7 | 9900 |
| 8 | 20439 |
| 9 | 39325 |
| 10 | 71603 |
| 11 | 124215 |
| 12 | 207076 |
| 13 | 333200 |
| 14 | 520272 |
| 15 | 790704 |
| 16 | 1173805 |
| 17 | 1705725 |
| 18 | 2432375 |
| 19 | 3409175 |
| 20 | 4704846 |
| 21 | 6400900 |
| 22 | 8596484 |
| 23 | 11407500 |
| 24 | 14972643 |
| 25 | 19452069 |
| 26 | 25034835 |
| 27 | 31936975 |
| 28 | 40410504 |
| 29 | 50740800 |
| 30 | 63257408 |
| 31 | 78330560 |