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 | -15 |
| 2 | 90 |
| 3 | -245 |
| 4 | 105 |
| 5 | 1107 |
| 6 | -2485 |
| 7 | 195 |
| 8 | 4860 |
| 9 | -2420 |
| 10 | -3990 |
| 11 | -8190 |
| 12 | 19695 |
| 13 | 13755 |
| 14 | -38475 |
| 15 | 3990 |
| 16 | -9750 |
| 17 | 34020 |
| 18 | 43015 |
| 19 | -46605 |
| 20 | -13860 |
| 21 | -127385 |
| 22 | 106485 |
| 23 | 165240 |
| 24 | -79275 |
| 25 | -16380 |
| 26 | -92340 |
| 27 | -35840 |
| 28 | -151995 |
| 29 | 188550 |
| 30 | 315783 |
| 31 | 90090 |
| 32 | -271215 |
| 33 | -307485 |
| 34 | 20475 |
| 35 | -505440 |
| 36 | 915385 |
| 37 | 209340 |
| 38 | -284130 |
| 39 | 337645 |
| 40 | -294225 |
| 41 | 269325 |
| 42 | -1707970 |
| 43 | -70305 |
| 44 | 1297620 |
| 45 | 574210 |
| 46 | 492765 |
| 47 | 251370 |
| 48 | -847245 |
| 49 | -1102725 |
| 50 | 438129 |
| 51 | -1416190 |
| 52 | 641445 |
| 53 | 0 |