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 | 7 |
| 1 | 63 |
| 2 | 560 |
| 3 | 4977 |
| 4 | 44233 |
| 5 | 393120 |
| 6 | 3493847 |
| 7 | 31051503 |
| 8 | 275969680 |
| 9 | 2452675617 |
| 10 | 21798110873 |
| 11 | 193730322240 |
| 12 | 1721774789287 |
| 13 | 15302242781343 |
| 14 | 135998410242800 |
| 15 | 1208683449403857 |
| 16 | 10742152634391913 |
| 17 | 95470690260123360 |
| 18 | 848494059706718327 |
| 19 | 7540975847100341583 |