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 | 128 |
| 1 | 10000000 |
| 2 | 612220032 |
| 3 | 8031810176 |
| 4 | 52523350144 |
| 5 | 230539333248 |
| 6 | 781250000000 |
| 7 | 2207984167552 |
| 8 | 5455160701056 |
| 9 | 12151280273024 |
| 10 | 24928547056768 |
| 11 | 47829690000000 |
| 12 | 86812553324672 |
| 13 | 150363025899136 |
| 14 | 250226879128704 |
| 15 | 402271083010688 |
| 16 | 627485170000000 |
| 17 | 953133216331392 |
| 18 | 1414067010444416 |