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 | 1 |
| 2 | 11 |
| 3 | 221 |
| 4 | 5531 |
| 5 | 154941 |
| 6 | 4649451 |
| 7 | 146150061 |
| 8 | 4750427771 |
| 9 | 158361063581 |
| 10 | 5384626548491 |
| 11 | 186023930383501 |
| 12 | 6511108452179611 |
| 13 | 230400987949757821 |
| 14 | 8228844334672249131 |
| 15 | 296245683962814194541 |
| 16 | 10739133812893020645051 |