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 | 28 |
| 2 | 784 |
| 3 | 21952 |
| 4 | 418550 |
| 5 | 7767740 |
| 6 | 136521398 |
| 7 | 2475199422 |
| 8 | 44835555921 |
| 9 | 819898395901 |
| 10 | 14951509967629 |
| 11 | 272888201632045 |
| 12 | 4974385897878190 |
| 13 | 90702815452479941 |
| 14 | 1653551877098790941 |
| 15 | 30149461492149942101 |