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 | -2 |
| 2 | -1 |
| 3 | 12 |
| 4 | -10 |
| 5 | -49 |
| 6 | 112 |
| 7 | 111 |
| 8 | -710 |
| 9 | 316 |
| 10 | 3233 |
| 11 | -5634 |
| 12 | -9505 |
| 13 | 40592 |
| 14 | -1934 |
| 15 | -204897 |
| 16 | 264664 |
| 17 | 717295 |
| 18 | -2243578 |
| 19 | -873336 |
| 20 | 12543857 |
| 21 | -11138050 |
| 22 | -50210993 |
| 23 | 119318436 |
| 24 | 108054622 |
| 25 | -743719745 |
| 26 | 372976064 |
| 27 | 3334358847 |
| 28 | -6051013534 |
| 29 | -9504084892 |
| 30 | 42720535345 |
| 31 | -4585483266 |
| 32 | -212470264817 |
| 33 | 287622301384 |