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 | 0 |
| 2 | 508 |
| 3 | 33551 |
| 4 | 2751328 |
| 5 | 216056493 |
| 6 | 18084221125 |
| 7 | 1548424793743 |
| 8 | 135655041210402 |
| 9 | 12054551765023934 |
| 10 | 1084635554912125542 |
| 11 | 98583402030663969332 |
| 12 | 9035771475185456034956 |