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 | 2 |
| 1 | 10 |
| 2 | 58 |
| 3 | 370 |
| 4 | 2482 |
| 5 | 17050 |
| 6 | 118378 |
| 7 | 825730 |
| 8 | 5771362 |
| 9 | 40373290 |
| 10 | 282534298 |
| 11 | 1977503890 |
| 12 | 13841818642 |
| 13 | 96890604730 |
| 14 | 678227855818 |
| 15 | 4747575858850 |
| 16 | 33232973616322 |
| 17 | 232630643127370 |
| 18 | 1628413985330938 |
| 19 | 11398896347634610 |