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 | 11 |
| 3 | 210 |
| 4 | 4180 |
| 5 | 83381 |
| 6 | 1663431 |
| 7 | 33185230 |
| 8 | 662041160 |
| 9 | 13207637961 |
| 10 | 263490718051 |
| 11 | 5256606723050 |
| 12 | 104868643742940 |
| 13 | 2092116268135741 |
| 14 | 41737456718971871 |
| 15 | 832657018111301670 |
| 16 | 16611402905507061520 |
| 17 | 331395401092029928721 |
| 18 | 6611296618935091512891 |