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 | 0 |
| 1 | 1 |
| 2 | 15 |
| 3 | 50 |
| 4 | 76 |
| 5 | 203 |
| 6 | 335 |
| 7 | -84 |
| 8 | 2696 |
| 9 | -3011 |
| 10 | -8433 |
| 11 | 130606 |
| 12 | -662348 |
| 13 | 1840439 |
| 14 | 2391823 |
| 15 | -67000872 |
| 16 | 478203152 |
| 17 | -1994884455 |
| 18 | 1669477263 |
| 19 | 56929821514 |
| 20 | -615188031396 |
| 21 | 3794477515715 |
| 22 | -12028579007921 |
| 23 | -50780206459996 |
| 24 | 1172949397939160 |
| 25 | -10766410530747243 |