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 | 0 |
| 3 | 4639 |
| 4 | 78799 |
| 5 | 65701 |
| 6 | 68701 |
| 7 | 1900501 |
| 8 | 24066079 |
| 9 | 12986041 |
| 10 | 5758291 |
| 11 | 63497419 |
| 12 | 126795511 |
| 13 | 85452991 |
| 14 | 693558301 |
| 15 | 1539113749 |
| 16 | 1265954431 |
| 17 | 959416471 |
| 18 | 8269773991 |
| 19 | 620669029 |
| 20 | 9487038451 |
| 21 | 1024481911 |
| 22 | 8285411491 |
| 23 | 21631441411 |
| 24 | 15981152869 |
| 25 | 23307738889 |
| 26 | 32551582849 |
| 27 | 114332503171 |