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 | 3 |
| 1 | -2 |
| 2 | 7 |
| 3 | -3 |
| 4 | 18 |
| 5 | -7 |
| 6 | 47 |
| 7 | -18 |
| 8 | 123 |
| 9 | -47 |
| 10 | 322 |
| 11 | -123 |
| 12 | 843 |
| 13 | -322 |
| 14 | 2207 |
| 15 | -843 |
| 16 | 5778 |
| 17 | -2207 |
| 18 | 15127 |
| 19 | -5778 |
| 20 | 39603 |
| 21 | -15127 |
| 22 | 103682 |
| 23 | -39603 |
| 24 | 271443 |
| 25 | -103682 |
| 26 | 710647 |
| 27 | -271443 |
| 28 | 1860498 |
| 29 | -710647 |
| 30 | 4870847 |
| 31 | -1860498 |
| 32 | 12752043 |
| 33 | -4870847 |
| 34 | 33385282 |
| 35 | -12752043 |
| 36 | 87403803 |
| 37 | -33385282 |
| 38 | 228826127 |
| 39 | -87403803 |