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 | 5 |
| 3 | 46 |
| 4 | 611 |
| 5 | 10486 |
| 6 | 217817 |
| 7 | 5232298 |
| 8 | 139988039 |
| 9 | 4014151966 |
| 10 | 116960920469 |
| 11 | 3089842957378 |
| 12 | 42760230799211 |
| 13 | -3590078035238330 |
| 14 | -540748879852479439 |
| 15 | -53293187072033883494 |
| 16 | -4741372656403996001905 |
| 17 | -409753919036526362138834 |