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 | 513 |
| 2 | 20195 |
| 3 | 281827 |
| 4 | 2215269 |
| 5 | 12030821 |
| 6 | 50431303 |
| 7 | 174571335 |
| 8 | 521638217 |
| 9 | 1387420489 |
| 10 | 3357947691 |
| 11 | 7517728043 |
| 12 | 15764279725 |
| 13 | 31265546157 |
| 14 | 59104406159 |
| 15 | 107162836111 |
| 16 | 187307353233 |
| 17 | 316947166865 |