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 | 27 |
| 2 | 96 |
| 3 | 432 |
| 4 | 1944 |
| 5 | 8856 |
| 6 | 40392 |
| 7 | 184248 |
| 8 | 840456 |
| 9 | 3833784 |
| 10 | 17488008 |
| 11 | 79772472 |
| 12 | 363886344 |
| 13 | 1659886776 |
| 14 | 7571661192 |
| 15 | 34538532408 |
| 16 | 157549339656 |
| 17 | 718669633464 |
| 18 | 3278249488008 |
| 19 | 14953908173112 |
| 20 | 68213041889544 |
| 21 | 311157393101496 |