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 | 4 |
| 2 | 112 |
| 3 | 3102 |
| 4 | 85818 |
| 5 | 2373870 |
| 6 | 65664106 |
| 7 | 1816344222 |
| 8 | 50242141946 |
| 9 | 1389754592846 |
| 10 | 38442187035914 |
| 11 | 1063354458854270 |
| 12 | 29413589398458778 |
| 13 | 813613216256931886 |
| 14 | 22505463603889302698 |
| 15 | 622526628016224886878 |
| 16 | 17219792020736937982522 |
| 17 | 476318961941184616298510 |