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 | 30 |
| 2 | 1023 |
| 3 | 44473 |
| 4 | 2475473 |
| 5 | 173721912 |
| 6 | 15088541896 |
| 7 | 1593719752240 |
| 8 | 201529405816816 |
| 9 | 30092049283982400 |
| 10 | 5242380158902146624 |
| 11 | 1054368810603158319360 |
| 12 | 242558905724502235934976 |
| 13 | 63305390270900389045395456 |
| 14 | 18607799824329123330114576384 |