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 | 0 |
| 1 | 1 |
| 2 | 123 |
| 3 | 15128 |
| 4 | 1860621 |
| 5 | 228841255 |
| 6 | 28145613744 |
| 7 | 3461681649257 |
| 8 | 425758697244867 |
| 9 | 52364858079469384 |
| 10 | 6440451785077489365 |
| 11 | 792123204706451722511 |
| 12 | 97424713727108484379488 |
| 13 | 11982447665229637126954513 |
| 14 | 1473743638109518258131025611 |
| 15 | 181258485039805516112989195640 |