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 | 5 |
| 2 | 12 |
| 3 | 44 |
| 4 | 51 |
| 5 | 280 |
| 6 | 949 |
| 7 | 103488 |
| 8 | 133416 |
| 9 | 4142957 |
| 10 | 81015132 |
| 11 | 141119360 |
| 12 | 2339121011 |
| 13 | 22104171804 |
| 14 | 658972588452 |
| 15 | 461228244281 |
| 16 | 3140753982224 |
| 17 | 7467448353120 |
| 18 | 49702513350325 |
| 19 | 3912991025369532 |
| 20 | 130254818350668557 |
| 21 | 177768662787348689760 |