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 | 5 |
| 2 | 39 |
| 3 | 346 |
| 4 | 3230 |
| 5 | 31191 |
| 6 | 309175 |
| 7 | 3129194 |
| 8 | 32211432 |
| 9 | 336239668 |
| 10 | 3551081432 |
| 11 | 37876866618 |
| 12 | 407453687104 |
| 13 | 4415521127579 |
| 14 | 48159808659879 |
| 15 | 528270329593474 |
| 16 | 5823991858003544 |
| 17 | 64497989461609224 |
| 18 | 717191431082458804 |