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 | 3 |
| 3 | 11 |
| 4 | 31 |
| 5 | 187 |
| 6 | 131 |
| 7 | 247 |
| 8 | 1993 |
| 9 | 4463 |
| 10 | 3635 |
| 11 | 395077 |
| 12 | 24441 |
| 13 | 81149 |
| 14 | 10414421 |
| 15 | 12868591 |
| 16 | 10764151 |
| 17 | 61170133 |
| 18 | 419426561 |
| 19 | 353495183 |
| 20 | 3429826973 |
| 21 | 29219934899 |
| 22 | 5110021867 |
| 23 | 142319532929 |
| 24 | 606916707064 |
| 25 | 87086496509 |
| 26 | 4426308633083 |
| 27 | 15954910019953 |
| 28 | 38414031851849 |