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 | -13 |
| 2 | 52 |
| 3 | 13 |
| 4 | -546 |
| 5 | 676 |
| 6 | 1911 |
| 7 | -962 |
| 8 | -9282 |
| 9 | -13624 |
| 10 | 53027 |
| 11 | 57408 |
| 12 | -48334 |
| 13 | -222912 |
| 14 | -558402 |
| 15 | 517803 |
| 16 | 1776723 |
| 17 | 2996227 |
| 18 | -1100554 |
| 19 | -14813461 |
| 20 | -12542478 |
| 21 | -3043521 |
| 22 | 50552853 |
| 23 | 110798116 |
| 24 | 84474624 |
| 25 | -114111322 |
| 26 | -650898679 |
| 27 | -771617782 |
| 28 | -206121175 |
| 29 | 1974416808 |
| 30 | 4748905980 |
| 31 | 5776813289 |