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 | 2 |
| 2 | 15 |
| 3 | 17 |
| 4 | 151 |
| 5 | 319 |
| 6 | 2703 |
| 7 | 3022 |
| 8 | 26879 |
| 9 | 56780 |
| 10 | 481119 |
| 11 | 1981256 |
| 12 | 10387399 |
| 13 | 95467847 |
| 14 | 10387399 |
| 15 | 137017443 |
| 16 | 695474614 |
| 17 | 1527966671 |
| 18 | 5279374627 |
| 19 | 27924839806 |
| 20 | 89053894045 |
| 21 | 562248204076 |
| 22 | 89053894045 |
| 23 | 740355992166 |
| 24 | 6011901831373 |
| 25 | 42823668811777 |
| 26 | 177306577078481 |