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 | 9 |
| 1 | 203 |
| 2 | 10767 |
| 3 | 46061 |
| 4 | 475793 |
| 5 | 6668731 |
| 6 | 13845629 |
| 7 | 91598867 |
| 8 | 266769639 |
| 9 | 435522233 |
| 10 | 1078275557 |
| 11 | 3609658883 |
| 12 | 10468384561 |
| 13 | 14540796059 |
| 14 | 36461681717 |
| 15 | 64117563369 |
| 16 | 83947073543 |
| 17 | 180056219381 |
| 18 | 289521339853 |
| 19 | 564930693271 |
| 20 | 1283176845407 |