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 | 26 |
| 3 | 291 |
| 4 | 2740 |
| 5 | 24005 |
| 6 | 201678 |
| 7 | 1647079 |
| 8 | 13176680 |
| 9 | 103766409 |
| 10 | 807072130 |
| 11 | 6214455467 |
| 12 | 47455841820 |
| 13 | 359873467213 |
| 14 | 2712892291382 |
| 15 | 20346692185455 |
| 16 | 151921968318160 |
| 17 | 1129919639366417 |
| 18 | 8374698503539434 |
| 19 | 61879716720597043 |