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 | 5 |
| 2 | 43 |
| 3 | 557 |
| 4 | 9643 |
| 5 | 208685 |
| 6 | 5419243 |
| 7 | 164184557 |
| 8 | 5684837803 |
| 9 | 221440158125 |
| 10 | 9584118542443 |
| 11 | 456289689634157 |
| 12 | 23698327407870763 |
| 13 | 1333388917719691565 |
| 14 | 80794290325166308843 |
| 15 | 5245268489291712773357 |
| 16 | 363231496206350038884523 |
| 17 | 26725646191850556128889005 |
| 18 | 2082075690178933613292014443 |