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 | 0 |
| 2 | 1 |
| 3 | 437 |
| 4 | 32338 |
| 5 | 898774 |
| 6 | 13420861 |
| 7 | 130567049 |
| 8 | 929084572 |
| 9 | 5210829060 |
| 10 | 24240197433 |
| 11 | 96985597357 |
| 12 | 342789175982 |
| 13 | 1092151142842 |
| 14 | 3186269918917 |
| 15 | 8618003504977 |
| 16 | 21826239750488 |
| 17 | 52182586901800 |
| 18 | 118565859736497 |
| 19 | 257462955231909 |
| 20 | 536839834252906 |
| 21 | 1079191653936254 |