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 | 35 |
| 2 | 871 |
| 3 | 19215 |
| 4 | 402591 |
| 5 | 8236095 |
| 6 | 166570111 |
| 7 | 3349906175 |
| 8 | 67183250431 |
| 9 | 1345516627455 |
| 10 | 26928850135551 |
| 11 | 538762184167935 |
| 12 | 10777095520297471 |
| 13 | 215560428864815615 |
| 14 | 4311393762242888191 |
| 15 | 86229727095755178495 |