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 | 0 |
| 2 | 9 |
| 3 | 278 |
| 4 | 16145 |
| 5 | 1471774 |
| 6 | 194652577 |
| 7 | 35275961958 |
| 8 | 8397548586177 |
| 9 | 2542220603893358 |
| 10 | 954003495852753401 |
| 11 | 434683708245705663766 |
| 12 | 236409592518584290327249 |
| 13 | 151286889086525353482149022 |
| 14 | 112534788142976814403622739921 |
| 15 | 96285847680519841273313314779974 |