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 | 17 |
| 1 | 119 |
| 2 | 325 |
| 3 | 1755 |
| 4 | 4097 |
| 5 | 28679 |
| 6 | 86037 |
| 7 | 438379 |
| 8 | 1118481 |
| 9 | 7829367 |
| 10 | 21251141 |
| 11 | 115203547 |
| 12 | 269553921 |
| 13 | 1886877447 |
| 14 | 5658395925 |
| 15 | 28837796715 |
| 16 | 73015558161 |
| 17 | 511108907127 |
| 18 | 1395885670725 |
| 19 | 7537782621915 |
| 20 | 17596749516801 |