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 | 1 |
| 1 | 2 |
| 2 | 21 |
| 3 | 44 |
| 4 | 109 |
| 5 | 153 |
| 6 | 2098 |
| 7 | 2251 |
| 8 | 17855 |
| 9 | 323641 |
| 10 | 665137 |
| 11 | 1653915 |
| 12 | 2319052 |
| 13 | 6292019 |
| 14 | 21195109 |
| 15 | 91072455 |
| 16 | 112267564 |
| 17 | 203340019 |
| 18 | 2959027830 |
| 19 | 6121395679 |
| 20 | 272300437706 |
| 21 | 278421833385 |
| 22 | 1107565937861 |
| 23 | 1385987771246 |
| 24 | 20511394735305 |
| 25 | 42408777241856 |
| 26 | 105328949219017 |
| 27 | 147737726460873 |