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) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 22 |
| 4 | 178 |
| 5 | 2114 |
| 6 | 36398 |
| 7 | 896128 |
| 8 | 31136246 |
| 9 | 1508259823 |
| 10 | 100727634758 |
| 11 | 9179951931947 |
| 12 | 1131033520118692 |
| 13 | 186769092227016256 |
| 14 | 41008206412935719870 |
| 15 | 11884278052476825052541 |
| 16 | 4514826724675651497522250 |
| 17 | 2234142899928806917974566378 |
| 18 | 1431533853656098851281985968328 |