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 | 2 |
| 1 | -4 |
| 2 | 8 |
| 3 | -14 |
| 4 | 18 |
| 5 | -36 |
| 6 | 56 |
| 7 | -74 |
| 8 | 116 |
| 9 | -164 |
| 10 | 224 |
| 11 | -324 |
| 12 | 442 |
| 13 | -592 |
| 14 | 808 |
| 15 | -1074 |
| 16 | 1410 |
| 17 | -1860 |
| 18 | 2416 |
| 19 | -3102 |
| 20 | 4010 |
| 21 | -5112 |
| 22 | 6464 |
| 23 | -8204 |
| 24 | 10294 |
| 25 | -12860 |
| 26 | 16072 |
| 27 | -19914 |
| 28 | 24586 |
| 29 | -30356 |
| 30 | 37248 |
| 31 | -45534 |
| 32 | 55608 |
| 33 | -67604 |
| 34 | 81928 |
| 35 | -99182 |
| 36 | 119608 |
| 37 | -143832 |
| 38 | 172760 |
| 39 | -206834 |
| 40 | 247048 |
| 41 | -294676 |
| 42 | 350504 |
| 43 | -416080 |
| 44 | 493248 |
| 45 | -583340 |
| 46 | 688616 |
| 47 | -811740 |
| 48 | 954974 |
| 49 | -1121564 |
| 50 | 1315504 |
| 51 | -1540210 |
| 52 | 1800434 |
| 53 | -2102060 |
| 54 | 2450224 |
| 55 | -2852040 |