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 | 13 |
| 3 | 381 |
| 4 | 17557 |
| 5 | 1100902 |
| 6 | 87116283 |
| 7 | 8312317976 |
| 8 | 927716186325 |
| 9 | 118504614869214 |
| 10 | 17044414451764396 |
| 11 | 2725298085020712539 |
| 12 | 479491040778079234419 |
| 13 | 92050364310704637832186 |
| 14 | 19146538134094625864605786 |
| 15 | 4289203871330156652985437480 |