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 | 12 |
| 2 | 144 |
| 3 | 180 |
| 4 | 900 |
| 5 | 3200 |
| 6 | 10660 |
| 7 | 40740 |
| 8 | 148240 |
| 9 | 526900 |
| 10 | 1931300 |
| 11 | 7015680 |
| 12 | 25336420 |
| 13 | 92086020 |
| 14 | 334206800 |
| 15 | 1211147700 |
| 16 | 4394975940 |
| 17 | 15944933760 |
| 18 | 57827661860 |
| 19 | 209781161700 |
| 20 | 761003136400 |
| 21 | 2760390765620 |
| 22 | 10013327220580 |
| 23 | 36323344673280 |