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 | 5 |
| 2 | 84 |
| 3 | 650 |
| 4 | 3324 |
| 5 | 13020 |
| 6 | 42240 |
| 7 | 118998 |
| 8 | 300300 |
| 9 | 693693 |
| 10 | 1490060 |
| 11 | 3011580 |
| 12 | 5779592 |
| 13 | 10608000 |
| 14 | 18728832 |
| 15 | 31957620 |
| 16 | 52907400 |
| 17 | 85261341 |
| 18 | 134115300 |
| 19 | 206402966 |
| 20 | 311417700 |
| 21 | 461446700 |
| 22 | 672534720 |
| 23 | 965396250 |
| 24 | 1366496820 |
| 25 | 1909325925 |
| 26 | 2635885980 |
| 27 | 3598423704 |
| 28 | 4861432400 |
| 29 | 6503955744 |
| 30 | 8622225920 |