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 | 4 |
| 2 | 32 |
| 3 | 344 |
| 4 | 4460 |
| 5 | 66532 |
| 6 | 1118398 |
| 7 | 20984924 |
| 8 | 437500380 |
| 9 | 10105541204 |
| 10 | 257860425672 |
| 11 | 7241521734020 |
| 12 | 222770819826574 |
| 13 | 7466859257161488 |
| 14 | 271156951835070930 |
| 15 | 10609740515840572076 |
| 16 | 444982726973034212924 |
| 17 | 19911203110764903275188 |
| 18 | 946564783226311159219150 |