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 | 1 |
| 2 | 3 |
| 3 | 27 |
| 4 | 324 |
| 5 | 4455 |
| 6 | 66339 |
| 7 | 1041012 |
| 8 | 16953624 |
| 9 | 283848543 |
| 10 | 4855304025 |
| 11 | 84482290035 |
| 12 | 1490628232080 |
| 13 | 26607713942628 |
| 14 | 479621100042756 |
| 15 | 8718235759397880 |
| 16 | 159628084420459248 |
| 17 | 2941328850997439439 |
| 18 | 54501093415540789605 |
| 19 | 1014898739548854163185 |