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 | 2 |
| 2 | 96 |
| 3 | 2562 |
| 4 | 47920 |
| 5 | 692610 |
| 6 | 8174544 |
| 7 | 81659522 |
| 8 | 708113304 |
| 9 | 5431848930 |
| 10 | 37403270520 |
| 11 | 233931828834 |
| 12 | 1341750437352 |
| 13 | 7114703302434 |
| 14 | 35117045235720 |
| 15 | 162298598439330 |
| 16 | 705951252118284 |
| 17 | 2903050518427962 |
| 18 | 11331495633292524 |
| 19 | 42132555868774010 |
| 20 | 149703679118108220 |